%0 Journal Article
%A N. S. Berezkina
%A I. P. Martynov
%T A system of partial differential equations
%J Differencialʹnye uravneniâ
%D 1991
%P 695-697
%V 27
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1991_27_4_a16/
%G ru
%F DE_1991_27_4_a16