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@article{AA_1999_11_5_a9, author = {L. Potyagailo and Sh. Wang}, title = {On the {co-Hopficity} of $3$-manifold groups}, journal = {Algebra i analiz}, pages = {194--220}, publisher = {mathdoc}, volume = {11}, number = {5}, year = {1999}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AA_1999_11_5_a9/} }
L. Potyagailo; Sh. Wang. On the co-Hopficity of $3$-manifold groups. Algebra i analiz, Tome 11 (1999) no. 5, pp. 194-220. http://geodesic.mathdoc.fr/item/AA_1999_11_5_a9/