On a problem of Neuwirth on knot groups
Doklady Akademii Nauk, Tome 153 (1963) no. 5, pp. 1017-1019.

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     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/}
}
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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/