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  1. A note on syntactical treatments of modality.Richmond H. Thomason - 1980 - Synthese 44 (3):391 - 395.
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  • Epistemic operators.Fred I. Dretske - 1970 - Journal of Philosophy 67 (24):1007-1023.
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  • Forever undecided: a puzzle guide to Gòˆdel.Raymond M. Smullyan - 1987 - New York: Oxford University Press.
    Collects a variety of mathematics and logic puzzles, some based on the theorems of the mathematician Kurt Godel.
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  • Epistemic Operators.Fred Dretske - 1999 - In Keith DeRose & Ted A. Warfield (eds.), Skepticism: a contemporary reader. New York: Oxford University Press.
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  • Facts and Certainty.Crispin Wright - 1985 - In Proceedings of the British Academy, Volume 71: 1985. Published for the British Academy by Oxford University Press. pp. 429-472.
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  • Descartes' Validation of Reason.Harry G. Frankfurt - 1965 - American Philosophical Quarterly 2 (2):149 - 156.
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