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  1. Implication and the algebra of logic.C. I. Lewis - 1912 - Mind 21 (84):522-531.
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  • (2 other versions)Les Logiques nouvelles des modalités.Robert Feys - 1937 - Revue Néo-Scolastique de Philosophie 40 (56):517-553.
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  • The stanhope demonstrator.Robert Harley - 1879 - Mind 4 (14):192-210.
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  • Maccoll's evolutionary design of language.Michael Astroh - 1998 - Nordic Journal of Philosophical Logic 3:141-174.
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