%0 Journal Article
%A A. A. Melikyan
%T Singular characteristics of first-order partial differential
%J Doklady Akademii Nauk
%D 1996
%P 24-28
%V 351
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1996_351_1_a6/
%G ru
%F DAN_1996_351_1_a6