%0 Journal Article
%A V. V. Shurygin
%T Generalization of a theorem
%J Trudy Geometricheskogo Seminara
%D 1979
%P 120-124
%V 11
%U http://geodesic.mathdoc.fr/item/KUTGS_1979_11_a14/
%G ru
%F KUTGS_1979_11_a14