J. C. C. McKinsey A Solution of the Decision Problem for the Lewis systems S2 and S4, with an Application to Topology. [Citation Graph (0, 0)][DBLP] J. Symb. Log., 1941, v:6, n:4, pp:117-134 [Journal]
C. H. Langford List of Officers and Members of the Association for Symbolic Logic. [Citation Graph (0, 0)][DBLP] J. Symb. Log., 1941, v:6, n:4, pp:174-178 [Journal]
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