%0 Journal Article
%A A. Dzhuraev
%T Degenerate systems of first-order partial differential systems
%J Doklady Akademii Nauk
%D 1992
%P 623-627
%V 323
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1992_323_4_a2/
%G ru
%F DAN_1992_323_4_a2