%0 Journal Article
%A P. G. Lasy
%T On the theory of stability in the first approximation of completely integrable Pfaffian systems
%J Differencialʹnye uravneniâ
%D 1983
%P 529-532
%V 19
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1983_19_3_a20/
%G ru
%F DE_1983_19_3_a20