Alan Ross Anderson, Nuel D. BelnapJr., and John R. Wallace. Independent axiom schemata for the pure theory of entailment. Zeitschrift für mathemutische Logik und Grundlagen der Mathematik, vol. 6 (1960), pp. 93–95.
1960 ◽
Vol 6
(1-6)
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pp. 93-95
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2009 ◽
Vol 22
(2)
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pp. 225-249
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1997 ◽
Vol 224
(2-3)
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pp. 253-261
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1974 ◽
Vol 137
(3)
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pp. 450
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