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  1. (2 other versions)Intuitionism: An Introduction.Arend Heyting - 1956 - Amsterdam,: North-Holland Pub. Co..
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  • Symbolic logic.Frederic Brenton Fitch - 1952 - New York,: Ronald Press Co..
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  • Brouwer's constructivism.Carl J. Posy - 1974 - Synthese 27 (1-2):125 - 159.
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  • Varieties of indeterminacy in the theory of general choice sequences.Carl J. Posy - 1976 - Journal of Philosophical Logic 5 (1):91 - 132.
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  • Symbolic logic.Clarence Irving Lewis - 1932 - [New York]: Dover Publications. Edited by Cooper Harold Langford.
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  • The theory of empirical sequences.Carl J. Posy - 1977 - Journal of Philosophical Logic 6 (1):47 - 81.
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