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@article{DAN_1963_153_5_a7, author = {H. Zieschang}, title = {On a problem of {Neuwirth} on knot groups}, journal = {Doklady Akademii Nauk}, pages = {1017--1019}, publisher = {mathdoc}, volume = {153}, number = {5}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1963_153_5_a7/} }
H. Zieschang. On a problem of Neuwirth on knot groups. Doklady Akademii Nauk, Tome 153 (1963) no. 5, pp. 1017-1019. http://geodesic.mathdoc.fr/item/DAN_1963_153_5_a7/