%0 Journal Article
%A V. I. Blagodatskikh
%T The convexity of spheres of attainability
%J Differencialʹnye uravneniâ
%D 1972
%P 2149-2155
%V 8
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1972_8_12_a3/
%G ru
%F DE_1972_8_12_a3