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  1. Toposes and Local Set Theories. An Introduction.J. L. Bell - 1990 - Journal of Symbolic Logic 55 (2):886-887.
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  • (5 other versions)Uber Sinn und Bedeutung.Gottlob Frege - 1892 - Zeitschrift für Philosophie Und Philosophische Kritik 100 (1):25-50.
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  • (5 other versions)Ueber Sinn und Bedeutung (Summary).Gottlob Frege - 1892 - Philosophical Review 1 (5):574-575.
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  • On the origins of David Hilbert's?Grundlagen der Geometrie?Michael Toepell - 1986 - Archive for History of Exact Sciences 35 (4):329-344.
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  • (1 other version)On the Foundations of Geometry and Formal Theories of Arithmetic.Gottlob Frege - 1974 - Mind 83 (329):131-133.
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