Michael Beeson The Nonderivability in Intuitionistic Formal Systems of Theorems on the Continuity of Effective Operations. [Citation Graph (0, 0)][DBLP] J. Symb. Log., 1975, v:40, n:3, pp:321-346 [Journal]
Robert A. Di Paola A Theorem on Shortening the Length of Proof in Formal Systems of Arithmetic. [Citation Graph (0, 0)][DBLP] J. Symb. Log., 1975, v:40, n:3, pp:398-400 [Journal]
Roy Edelstein An Interpolation Lemma for the Pure Implicational Calculus. [Citation Graph (0, 0)][DBLP] J. Symb. Log., 1975, v:40, n:3, pp:443-444 [Journal]
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