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E. J. Lemmon. Symposium: Is there only one correct system of modal logic? I.Aristotelian Society supplementary volume XXXIII, London1959, pp. 23–40. - G. P. Henderson. Is there only one correct system of modal logic? II. Aristotelian Society supplementary volume XXXIII, London1959, pp. 41–56.
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- The Journal of Symbolic Logic / Volume 34 / Issue 2 / 25 July 1969
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- 12 March 2014, p. 306
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- 25 July 1969
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Naoto Yonemitsu. On systems of strict implication. Tôhoku mathematical journal, ser. 2 vol. 3 (1951), pp. 48–58.
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- The Journal of Symbolic Logic / Volume 16 / Issue 4 / December 1951
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- 12 March 2014, p. 278
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- December 1951
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Maurice L'Abbé. On the independence of Henkin's axioms for fragments of the propositional calculus. The journal of symbolic logic, vol. 16 (1951) pp. 43–45.
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- The Journal of Symbolic Logic / Volume 16 / Issue 3 / September 1951
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- 12 March 2014, p. 228
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- September 1951
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On the semantic non-completeness of certain Lewis calculi
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- The Journal of Symbolic Logic / Volume 16 / Issue 2 / June 1951
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- 12 March 2014, pp. 127-129
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- June 1951
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Results concerning the decision problem of Lewis's calculi S3 and S6
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- The Journal of Symbolic Logic / Volume 14 / Issue 4 / January 1950
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- 12 March 2014, pp. 230-236
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- January 1950
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A note concerning the paradoxes of strict implication and Lewis's system SI
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- The Journal of Symbolic Logic / Volume 13 / Issue 3 / December 1948
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- 12 March 2014, pp. 138-139
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- December 1948
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