%0 Journal Article
%A S. A. Gal'pern
%A V. E. Kondrashov
%T The Cauchy problem for a differential operator decomposing into wave factors
%J Doklady Akademii Nauk
%D 1964
%P 757-759
%V 154
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1964_154_4_a2/
%G ru
%F DAN_1964_154_4_a2