%0 Journal Article
%A V. Ya. Ivrii
%T The Cauchy problem for nonstrictly hyperbolic equations of second order
%J Doklady Akademii Nauk
%D 1971
%P 778-781
%V 201
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1971_201_4_a3/
%G ru
%F DAN_1971_201_4_a3