%0 Journal Article %A S. A. Gal'pern %A V. E. Kondrašov %T The Cauchy problem for differential operators which decompose into wave factors %J Trudy Moskovskogo matematičeskogo obŝestva %D 1967 %P 109-136 %V 16 %I mathdoc %U http://geodesic.mathdoc.fr/item/MMO_1967_16_a4/ %G ru %F MMO_1967_16_a4