%0 Journal Article %A S. M. Ponomarev %T On the question of the abstract Cauchy problem %J Differencialʹnye uravneniâ %D 1973 %P 1334-1338 %V 9 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1973_9_7_a18/ %G ru %F DE_1973_9_7_a18