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@article{MAT_1960_4_1_a1, author = {A. Shapiro and J. H. Whitehead}, title = {A proof and extension of {Dehn's} lemma}, journal = {Matematika}, pages = {9--14}, publisher = {mathdoc}, volume = {4}, number = {1}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1960_4_1_a1/} }
A. Shapiro; J. H. Whitehead. A proof and extension of Dehn's lemma. Matematika, Tome 4 (1960) no. 1, pp. 9-14. http://geodesic.mathdoc.fr/item/MAT_1960_4_1_a1/