%0 Journal Article
%A Yu. T. Lisitsa
%T Hopf’s classification theorem in the theory of shapes
%J Doklady Akademii Nauk
%D 1975
%P 1056-1059
%V 223
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1975_223_5_a4/
%G ru
%F DAN_1975_223_5_a4