%0 Journal Article
%A N. Satimov
%T Some generalizations of L. S. Pontryagin's square lemma
%J Differencialʹnye uravneniâ
%D 1984
%P 1548-1555
%V 20
%N 9
%U http://geodesic.mathdoc.fr/item/DE_1984_20_9_a9/
%G ru
%F DE_1984_20_9_a9