%0 Journal Article
%A T. V. Treneva
%T On a four-dimensional not strongly elliptic system
%J Differencialʹnye uravneniâ
%D 1982
%P 351-353
%V 18
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1982_18_2_a23/
%G ru
%F DE_1982_18_2_a23