Switch to: References

Add citations

You must login to add citations.
  1. Downward causation without foundations.Michel Bitbol - 2012 - Synthese 185 (2):233-255.
    Emergence is interpreted in a non-dualist framework of thought. No metaphysical distinction between the higher and basic levels of organization is supposed, but only a duality of modes of access. Moreover, these modes of access are not construed as mere ways of revealing intrinsic patterns of organization: They are supposed to be constitutive of them, in Kant’s sense. The emergent levels of organization, and the inter-level causations as well, are therefore neither illusory nor ontologically real: They are objective in the (...)
    Download  
     
    Export citation  
     
    Bookmark   12 citations  
  • Emergence and singular limits.Andrew Wayne - 2012 - Synthese 184 (3):341-356.
    Recent work by Robert Batterman and Alexander Rueger has brought attention to cases in physics in which governing laws at the base level “break down” and singular limit relations obtain between base- and upper-level theories. As a result, they claim, these are cases with emergent upper-level properties. This paper contends that this inference—from singular limits to explanatory failure, novelty or irreducibility, and then to emergence—is mistaken. The van der Pol nonlinear oscillator is used to show that there can be a (...)
    Download  
     
    Export citation  
     
    Bookmark   17 citations  
  • (1 other version)Metaphysical emergence: Weak and Strong.Jessica Wilson - 2013 - In Stephen Mumford & Matthew Tugby (eds.), Metaphysics and Science. Oxford: Oxford University Press. pp. 251-306.
    Motivated by the seeming structure of the sciences, metaphysical emergence combines broadly synchronic dependence coupled with some degree of ontological and causal autonomy. Reflecting the diverse, frequently incompatible interpretations of the notions of dependence and autonomy, however, accounts of emergence diverge into a bewildering variety. Here I argue that much of this apparent diversity is superficial. I first argue, by attention to the problem of higher-level causation, that two and only two strategies for addressing this problem accommodate the genuine emergence (...)
    Download  
     
    Export citation  
     
    Bookmark   72 citations  
  • Emergence in physics.Andrew Wayne & Michal Arciszewski - 2009 - Philosophy Compass 4 (5):846-858.
    This paper begins by tracing interest in emergence in physics to the work of condensed matter physicist Philip Anderson. It provides a selective introduction to contemporary philosophical approaches to emergence. It surveys two exciting areas of current work that give good reason to re-evaluate our views about emergence in physics. One area focuses on physical systems wherein fundamental theories appear to break down. The other area is the quantum-to-classical transition, where some have claimed that a complete explanation of the behaviors (...)
    Download  
     
    Export citation  
     
    Bookmark   5 citations  
  • (1 other version)Irrational methods suggest indecomposability and emergence.Hamed Tabatabaei Ghomi - 2023 - European Journal for Philosophy of Science 13 (1):1-21.
    This paper offers a practical argument for metaphysical emergence. The main message is that the growing reliance on so-called irrational scientific methods provides evidence that objects of science are indecomposable and as such, are better described by metaphysical emergence as opposed to the prevalent reductionistic metaphysics. I show that a potential counterargument that science will eventually reduce everything to physics has little weight given where science is heading with its current methodological trend. I substantiate my arguments by detailed examples from (...)
    Download  
     
    Export citation  
     
    Bookmark   1 citation  
  • The estimator theory of life and mind: how agency and consciousness can emerge.J. H. Van Hateren - manuscript
    This book provides a comprehensive overview of my recent theoretical work that aims to explain some of the more puzzling properties of life and mind, in particular agency, goal-directedness and consciousness. It contains published papers as well as new material. Table of contents: Preface - PART I: GROUNDWORK - 1. Introduction - 2. The basic mechanism - 3. Inclusive and extensive fitness - 4. Components of F and X - 5. The consequences: a preview - PART II: LIFE - 6. (...)
    Download  
     
    Export citation  
     
    Bookmark  
  • A mechanism that realizes strong emergence.J. H. van Hateren - 2021 - Synthese 199:12463-12483.
    The causal efficacy of a material system is usually thought to be produced by the law-like actions and interactions of its constituents. Here, a specific system is constructed and explained that produces a cause that cannot be understood in this way, but instead has novel and autonomous efficacy. The construction establishes a proof-of-feasibility of strong emergence. The system works by utilizing randomness in a targeted and cyclical way, and by relying on sustained evolution by natural selection. It is not vulnerable (...)
    Download  
     
    Export citation  
     
    Bookmark   2 citations  
  • The Tangled Dialectic of Body and Consciousness: A Metaphysical Counterpart of Radical Neurophenomenology.Michel Bitbol - 2021 - Constructivist Foundations 16 (2):141-151.
    Context: Varela’s neurophenomenology was conceived from the outset as a criticism and dissolution of the “hard problem” of the physical origin of consciousness. Indeed, the standard (….
    Download  
     
    Export citation  
     
    Bookmark   4 citations  
  • Foundations of an Ethical Framework for AI Entities: the Ethics of Systems.Andrej Dameski - 2020 - Dissertation, University of Luxembourg
    The field of AI ethics during the current and previous decade is receiving an increasing amount of attention from all involved stakeholders: the public, science, philosophy, religious organizations, enterprises, governments, and various organizations. However, this field currently lacks consensus on scope, ethico-philosophical foundations, or common methodology. This thesis aims to contribute towards filling this gap by providing an answer to the two main research questions: first, what theory can explain moral scenarios in which AI entities are participants?; and second, what (...)
    Download  
     
    Export citation  
     
    Bookmark  
  • The Hammer and the Nail : Interdisciplinarity and Problem Solving in Sustainability Science.Henrik Thorén - 2015 - Dissertation, Lund University
    This is a thesis about interdisciplinarity, scientific integration, and problem solving in sustainability science. Sustainability science is an emerging and highly interdisciplinary field that seeks to integrate vastly differentiated bodies of knowledge in addressing the challenge of transitioning contemporary societies towards sustainability. Interdisciplinarity is paramount. Interdisciplinarity in general, and in the context of sustainability science in particular, has often been associated with solving particular problems and problem solving is one important theme in this thesis. A central idea that is developed (...)
    Download  
     
    Export citation  
     
    Bookmark   3 citations  
  • Emergence without limits: The case of phonons.Alexander Franklin & Eleanor Knox - 2018 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 64 (C):68-78.
    Recent discussions of emergence in physics have focussed on the use of limiting relations, and often particularly on singular or asymptotic limits. We discuss a putative example of emergence that does not fit into this narrative: the case of phonons. These quasi-particles have some claim to be emergent, not least because the way in which they relate to the underlying crystal is almost precisely analogous to the way in which quantum particles relate to the underlying quantum field theory. But there (...)
    Download  
     
    Export citation  
     
    Bookmark   24 citations  
  • Group-level traits emerge.Paul E. Smaldino - 2014 - Behavioral and Brain Sciences 37 (3):281-295.
    Most commentators supported the thesis of the target article, though there were also those who were less fully persuaded. I will begin with a response to the most critical commentaries. First, I will justify an evolutionary perspective that includes group organization and nongenetic inheritance. Next, I will discuss the concept of emergence. Following that, I will transition to an exploration of ideas and concerns brought up by some of the more supportive commentators. This will include a discussion of different types (...)
    Download  
     
    Export citation  
     
    Bookmark   2 citations  
  • Response to R. Keith Sawyer.Jens Greve - 2013 - Philosophy of the Social Sciences 43 (2):246-256.
    R. Keith Sawyer rightly claimed that the formulation of several cross-level regularities does not disprove the “autonomy” of sciences. Nevertheless, first, this autonomy becomes gradual because cross-level regularities narrow the scope for strong emergence and, second, these examples do not disprove the metaphysical premises of Kim’s critique. Sawyer and I concur on the thesis according to which the proof of strong emergence is in part an empirical question. However, it also depends on the concept of individualism applied whether a description (...)
    Download  
     
    Export citation  
     
    Bookmark   2 citations  
  • Determinism, predictability and open-ended evolution: lessons from computational emergence.Philippe Huneman - 2012 - Synthese 185 (2):195-214.
    Among many properties distinguishing emergence, such as novelty, irreducibility and unpredictability, computational accounts of emergence in terms of computational incompressibility aim first at making sense of such unpredictability. Those accounts prove to be more objective than usual accounts in terms of levels of mereology, which often face objections of being too epistemic. The present paper defends computational accounts against some objections, and develops what such notions bring to the usual idea of unpredictability. I distinguish the objective unpredictability, compatible with determinism (...)
    Download  
     
    Export citation  
     
    Bookmark   9 citations  
  • Effective Spacetime: Understanding Emergence in Effective Field Theory and Quantum Gravity.Karen Crowther - 2016 - Cham: Springer.
    This book discusses the notion that quantum gravity may represent the "breakdown" of spacetime at extremely high energy scales. If spacetime does not exist at the fundamental level, then it has to be considered "emergent", in other words an effective structure, valid at low energy scales. The author develops a conception of emergence appropriate to effective theories in physics, and shows how it applies (or could apply) in various approaches to quantum gravity, including condensed matter approaches, discrete approaches, and loop (...)
    Download  
     
    Export citation  
     
    Bookmark   35 citations  
  • Decomposing complexity: the discovering of pathway dynamics.Adam White - unknown
    Biochemists often adopt what may be called the “Strategy of Decomposition” for the causal discovery of biochemical pathway dynamic behaviours. This involves decomposing a pathway into a set of isolated parts, which are then analysed separately. It is assumed that knowledge gained of the isolated parts can then be used to explain the dynamic behaviours of the whole pathway. My thesis addresses the extent to which use of the Strategy of Decomposition is warranted. I evaluate two challenges contained in Bechtel (...)
    Download  
     
    Export citation  
     
    Bookmark  
  • Appearing Out of Nowhere: The Emergence of Spacetime in Quantum Gravity.Karen Crowther - 2014 - Dissertation, University of Sydney
    Quantum gravity is understood as a theory that, in some sense, unifies general relativity (GR) and quantum theory, and is supposed to replace GR at extremely small distances (high-energies). It may be that quantum gravity represents the breakdown of spacetime geometry described by GR. The relationship between quantum gravity and spacetime has been deemed ``emergence'', and the aim of this thesis is to investigate and explicate this relation. After finding traditional philosophical accounts of emergence to be inappropriate, I develop a (...)
    Download  
     
    Export citation  
     
    Bookmark   5 citations  
  • Formulating Emergence.Michele Paolini Paoletti - 2018 - Ratio 31 (S1):1-18.
    Emergence is intuitively characterized as dependent novelty. Yet, besides this intuition, several formulations of it were elaborated in the last decades. In this article, after having distinguished between two different varieties of emergence, I aim at providing two formulation schemes for emergence. This could help to explain what emergence is and to clarify and unify the suggested formulations. The general idea behind my schemes is that emergence is partial and qualified dependence of the emergent entities on their emergence bases. After (...)
    Download  
     
    Export citation  
     
    Bookmark   5 citations  
  • Testing Bottom-Up Models of Complex Citation Networks.Mark A. Bedau - 2014 - Philosophy of Science 81 (5):1131-1143.
    The robust behavior of the patent citation network is a complex target of recent bottom-up models in science. This paper investigates the purpose and testing of three especially simple bottom-up models of the citation count distribution observed in the patent citation network. The complex causal webs in the models generate weakly emergent patterns of behavior, and this explains both the need for empirical observation of computer simulations of the models and the epistemic harmlessness of the resulting epistemic opacity.
    Download  
     
    Export citation  
     
    Bookmark   3 citations  
  • Emergence and non‐personal theology.Zachary Simpson - 2013 - Zygon 48 (2):405-427.
    In response to recent theories of emergence which attempt to examine system dynamics and the evolution of complexity from physics to biology and consciousness, a number of theologians have attempted to distill religious insights from a philosophical concept of emergence. Recent work by Terrence Deacon, however, which emphasizes constraint and a process understanding of complexity, undercuts significant features in emergent theologies, namely the privileging of certain loci within emergent complexity, an emphasis on efficient causation, and, theologically, an agential and personal (...)
    Download  
     
    Export citation  
     
    Bookmark   1 citation  
  • A Defense of Emergence.Jason Megill - 2013 - Axiomathes 23 (4):597-615.
    I defend a physicalistic version of ontological emergence; qualia emerge from the brain, but are physical properties nevertheless. First, I address the following questions: what are the central tenets of physicalistic ontological emergentism; what are the relationships between these tenets; what is the relationship between physicalistic ontological emergentism and non-reductive physicalism; and can there even be a physicalistic version of ontological emergentism? This discussion is merely an attempt to clarify exactly what a physicalistic version of ontological emergentism must claim, and (...)
    Download  
     
    Export citation  
     
    Bookmark   1 citation  
  • (2 other versions)From Silico to Vitro: Computational Models of Complex Biological Systems Reveal Real-World Emergent Phenomena.Orly Stettiner - 2016 - In Vincent C. Müller (ed.), Computing and philosophy: Selected papers from IACAP 2014. Cham: Springer. pp. 133-147.
    Computer simulations constitute a significant scientific tool for promoting scientific understanding of natural phenomena and dynamic processes. Substantial leaps in computational force and software engineering methodologies now allow the design and development of large-scale biological models, which – when combined with advanced graphics tools – may produce realistic biological scenarios, that reveal new scientific explanations and knowledge about real life phenomena. A state-of-the-art simulation system termed Reactive Animation (RA) will serve as a study case to examine the contemporary philosophical debate (...)
    Download  
     
    Export citation  
     
    Bookmark  
  • How Powers Emerge from Relations.Michele Paolini Paoletti - 2016 - Axiomathes 26 (2):187-204.
    I shall explore in this article the metaphysical possibility of powers’ strongly emerging from relations. After having provided a definition of emergent powers that is also based on the distinction between the possession and the activation of a power, I shall introduce different sorts of Relations that Ground Emergence, both external and internal. Later on, I shall discuss some examples of powers that are grounded on their instantiation. Finally, I shall examine the consequences of accepting such relations within a physicalistic (...)
    Download  
     
    Export citation  
     
    Bookmark   10 citations  
  • Mechanism, Reduction, and Emergence in Two Stories of the Human Epistemic Enterprise.Paul Teller - 2010 - Erkenntnis 73 (3):413 - 425.
    The traditional way of thinking about science goes back to the corpuscular philosophy with its micro-reductive mechanism and metaphor of reading God's Book of Nature. This "story-1" with its rhetoric of exact truths contrasts with "story-2" which describes science as a continuation of the always imperfect powers of representation given to us by evolution. On story-2 reduction is one among other knowledge fashioning strategies and shares the imperfections of all human knowledge. When we appreciate that human knowledge always admits of (...)
    Download  
     
    Export citation  
     
    Bookmark   5 citations  
  • Is the creation of artificial life morally significant?Thomas Douglas, Russell Powell & Julian Savulescu - 2013 - Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences 44 (4b):688-696.
    In 2010, the Venter lab announced that it had created the first bacterium with an entirely synthetic genome. This was reported to be the first instance of ‘artificial life,’ and in the ethical and policy discussions that followed it was widely assumed that the creation of artificial life is in itself morally significant. We cast doubt on this assumption. First we offer an account of the creation of artificial life that distinguishes this from the derivation of organisms from existing life (...)
    Download  
     
    Export citation  
     
    Bookmark   12 citations  
  • (1 other version)System odpornościowy, ja immunologiczne. Wprowadzenie.Bartlomiej Swiatczak - 2012 - Avant: Trends in Interdisciplinary Studies 3 (1).
    [Przekład] Pogląd głoszący, że układ odpornościowy rozróżnia to, co swoje, od tego, co obce, był jednym z centralnych założeń immunologii w drugiej połowie XX wieku. Pogląd ten miał wpływ na projekty eksperymentalne i interpretowanie danych. Jednakże w obliczu nowych dowodów empirycznych konieczny jest w immunologii nowy aparat konceptualny.
    Download  
     
    Export citation  
     
    Bookmark  
  • Weak emergence drives the science, epistemology, and metaphysics of synthetic biology.Mark A. Bedau - 2013 - Biological Theory 8 (4):334-345.
    Top-down synthetic biology makes partly synthetic cells by redesigning simple natural forms of life, and bottom-up synthetic biology aims to make fully synthetic cells using only entirely nonliving components. Within synthetic biology the notions of complexity and emergence are quite controversial, but the imprecision of key notions makes the discussion inconclusive. I employ a precise notion of weak emergent property, which is a robust characteristic of the behavior of complex bottom-up causal webs, where a complex causal web is one that (...)
    Download  
     
    Export citation  
     
    Bookmark   5 citations  
  • Mapping an expanding territory: computer simulations in evolutionary biology.Philippe Huneman - 2014 - History and Philosophy of the Life Sciences 36 (1):60-89.
    The pervasive use of computer simulations in the sciences brings novel epistemological issues discussed in the philosophy of science literature since about a decade. Evolutionary biology strongly relies on such simulations, and in relation to it there exists a research program (Artificial Life) that mainly studies simulations themselves. This paper addresses the specificity of computer simulations in evolutionary biology, in the context (described in Sect. 1) of a set of questions about their scope as explanations, the nature of validation processes (...)
    Download  
     
    Export citation  
     
    Bookmark   3 citations  
  • Constructivism and Computation: Can Computer-Based Modeling Add to the Case for Constructivism?M. Füllsack - 2013 - Constructivist Foundations 9 (1):7-16.
    Problem: Is constructivism contradicted by the reductionist determinism inherent in digital computation? Method: Review of examples from dynamical systems sciences, agent-based modeling and artificial intelligence. Results: Recent scientific insights seem to give reason to consider constructivism in line with what computation is adding to our knowledge of interacting dynamics and the functioning of our brains. Implications: Constructivism is not necessarily contradictory to digital computation, in particular to computer-based modeling and simulation. Constructivist content: When viewed through the lens of computation, in (...)
    Download  
     
    Export citation  
     
    Bookmark  
  • A philosophical analysis of the emergence of language.Hamed Tabatabaei Ghomi & Antonio Benítez-Burraco - 2024 - Theoria 90 (1):30-55.
    There is a research programme in linguistics that is founded on describing language as an emergent phenomenon. This paper clarifies how the core concept of emergence is deployed in this emergentist programme. We show that if one adopts the weak understandings of the concept of language emergence, the emergentist programme is not fundamentally different from the other non-emergentist research programmes in linguistics. On the other hand, if one adopts the stronger understandings of emergence then the programme would have a unique (...)
    Download  
     
    Export citation  
     
    Bookmark  
  • (1 other version)Irrational methods suggest indecomposability and emergence.Hamed Tabatabaei Ghomi - 2023 - European Journal for Philosophy of Science 13 (1):1-21.
    This paper offers a practical argument for metaphysical emergence. The main message is that the growing reliance on so-called irrational scientific methods provides evidence that objects of science are indecomposable and as such, are better described by metaphysical emergence as opposed to the prevalent reductionistic metaphysics. I show that a potential counterargument that science will eventually reduce everything to physics has little weight given where science is heading with its current methodological trend. I substantiate my arguments by detailed examples from (...)
    Download  
     
    Export citation  
     
    Bookmark   1 citation  
  • Auto-organización y autopoiesis.Arantza Etxeberria & Leonardo Bich - 2017 - In Etxeberria Arantza & Bich Leonardo (eds.), Diccionario Interdisciplinar Austral. Instituto de Filosofía - Universidad Austral.
    El prefijo “auto” en autoorganización y autopoiesis se refiere a la existencia de una identidad o agencialidad implicada en el orden, organización o producción de un sistema que se corresponde con el sistema mismo, en contraste con el diseño o la influencia de carácter externo. La autoorganización (AO) estudia la manera en la que los procesos de un sistema alcanzan de forma espontánea un orden u organización complejo, bien como una estructura o patrón emergente, bien como algún tipo de finalidad (...)
    Download  
     
    Export citation  
     
    Bookmark  
  • An explication of emergence.Elanor Taylor - 2015 - Philosophical Studies 172 (3):653-669.
    Philosophical debates about emergence are often marred by equivocation and lack of common ground, and dialogue about emergence between scientists and philosophers can be equally difficult. In this paper I offer a unified explication of emergence and argue that this explication can cut through much of the confusion evident in discussions of emergence. I defend an explication of the concept of emergence as the unavailability of a certain kind of scientific explanation for an observer or observers.
    Download  
     
    Export citation  
     
    Bookmark   14 citations  
  • Complex emergence and the living organization: an epistemological framework for biology.Leonardo Bich - 2012 - Synthese 185 (2):215-232.
    In this article an epistemological framework is proposed in order to integrate the emergentist thought with systemic studies on biological autonomy, which are focused on the role of organization. Particular attention will be paid to the role of the observer’s activity, especially: (a) the different operations he performs in order to identify the pertinent elements at each descriptive level, and (b) the relationships between the different models he builds from them. According to the approach sustained here, organization will be considered (...)
    Download  
     
    Export citation  
     
    Bookmark   15 citations  
  • Setting the Demons Loose: Computational Irreducibility Does Not Guarantee Unpredictability or Emergence.Hamed Tabatabaei Ghomi - 2022 - Philosophy of Science 89 (4):761-783.
    A phenomenon resulting from a computationally irreducible (or computationally incompressible) process is supposedly unpredictable except via simulation. This notion of unpredictability has been deployed to formulate recent accounts of computational emergence. Via a technical analysis, I show that computational irreducibility can establish the impossibility of prediction only with respect to maximum standards of precision. By articulating the graded nature of prediction, I show that unpredictability to maximum standards is not equivalent to being unpredictable in general. I conclude that computational irreducibility (...)
    Download  
     
    Export citation  
     
    Bookmark   3 citations  
  • Novedades emergentes: una propuesta naturalista al aprendizaje práctico.Ximena A. González Grandón - 2014 - Metatheoria – Revista de Filosofía E Historia de la Ciencia 5:129--143.
    Download  
     
    Export citation  
     
    Bookmark  
  • Pursuing Natural Piety: Understanding Ontological Emergence and Distinguishing it from Physicalism.Peter Fazekas - 2014 - Dialectica 68 (1):97-119.
    This paper focuses on two issues related to ontological emergence: whether it is a coherent notion, and its relation to the doctrine of physicalism. First, it is argued that ontological emergence is best understood as a thesis relying on three fundamental tenets claiming that emergents are basic, genuinely causal, and determined by the physical realm. The paper elucidates the roles of these tenets, and introduces an interpretation that is able to resolve any apparent contradiction between the tenets, thereby supporting the (...)
    Download  
     
    Export citation  
     
    Bookmark   3 citations  
  • On the Exploratory Function of Agent-Based Modeling.Meinard Kuhlmann - 2021 - Perspectives on Science 29 (4):510-536.
    Agent-based models derive the behavior of artificial socio-economic entities computationally from the actions of a large number of agents. One objection is that highly idealized ABMs fail to represent the real world in any reasonable sense. Another objection is that they at best show how observed patterns may have come about, because simulations are easy to produce and there is no evidence that this is really what happens. Moreover, different models may well yield the same result. I will rebut these (...)
    Download  
     
    Export citation  
     
    Bookmark   2 citations  
  • Emergence and interacting hierarchies in shock physics.Mark Pexton - 2016 - European Journal for Philosophy of Science 6 (1):91-122.
    It is argued that explanations of shock waves display explanatory emergence in two different ways. Firstly, the use of discontinuities to model jumps in flow variables is an example of “physics avoidance”. This is where microphysical details can be ignored in an abstract model thus allowing us access to modal information which cannot be attained in principle in any other way. Secondly, Whitham’s interleaving criterion for continuous shock structure is an example of the way different characteristic scales interact in shock (...)
    Download  
     
    Export citation  
     
    Bookmark  
  • Reduction and emergence in the fractional quantum Hall state.Tom Lancaster & Mark Pexton - 2015 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 52 (Part B):343-357.
    Download  
     
    Export citation  
     
    Bookmark   9 citations  
  • Equation or Algorithm: Differences and Choosing Between Them.C. Gaucherel & S. Bérard - 2010 - Acta Biotheoretica 59 (1):67-79.
    The issue of whether formal reasoning or a computing-intensive approach is the most efficient manner to address scientific questions is the subject of some considerable debate and pertains not only to the nature of the phenomena and processes investigated by scientists, but also the nature of the equation and algorithm objects they use. Although algorithms and equations both rely on a common background of mathematical language and logic, they nevertheless possess some critical differences. They do not refer to the same (...)
    Download  
     
    Export citation  
     
    Bookmark   2 citations  
  • Awareness as observational heterarchy.Kohei Sonoda, Kentaro Kodama & Yukio-Pegio Gunji - 2013 - Frontiers in Psychology 4.
    Download  
     
    Export citation  
     
    Bookmark   2 citations