%0 Journal Article
%A V. Ya. Ivrii
%T Differential equations, with multiple characteristics, that have no solutions
%J Doklady Akademii Nauk
%D 1971
%P 279-282
%V 198
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1971_198_2_a5/
%G ru
%F DAN_1971_198_2_a5