%0 Journal Article
%A H. Zieschang
%T On a problem of Neuwirth on knot groups
%J Doklady Akademii Nauk
%D 1963
%P 1017-1019
%V 153
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1963_153_5_a7/
%G ru
%F DAN_1963_153_5_a7