%0 Journal Article
%A T. I. Zelenyak
%T A mixed problem for an equation which cannot be solved for the highest-order time derivative
%J Doklady Akademii Nauk
%D 1964
%P 1268-1270
%V 158
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1964_158_6_a6/
%G ru
%F DAN_1964_158_6_a6