%0 Journal Article
%A G. N. Tyurina
%T On a type of contractible curves
%J Doklady Akademii Nauk
%D 1967
%P 529-531
%V 173
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1967_173_3_a11/
%G ru
%F DAN_1967_173_3_a11