%0 Journal Article
%A È. I. Grudo
%A L. F. Yanchuk
%T Inequalities of Gronwall, Bihari and Langenhop type for Pfaffian systems
%J Differencialʹnye uravneniâ
%D 1977
%P 749-752
%V 13
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_4_a21/
%G ru
%F DE_1977_13_4_a21