%0 Journal Article
%A V. Ya. Ivrii
%T The Cauchy problem for nonstrictly hyperbolic equations
%J Doklady Akademii Nauk
%D 1971
%P 517-519
%V 197
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1971_197_3_a2/
%G ru
%F DAN_1971_197_3_a2