A. Shapiro, J. H. Whitehead, “A proof and extension of Dehn's lemma”, Matematika, 1960, Volume 4, Issue 1,Pages <nobr>9

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Matematika, 1960 Volume 4, Issue 1, Pages 9–14 (Mi mat119)

A proof and extension of Dehn's lemma

A. Shapiro, J. H. Whitehead

English version: , 1958, 64, 174–178

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