%0 Journal Article %A A. I. Vol'pert %A S. I. Khudyaev %T On the Cauchy problem for composite systems of nonlinear differential equations %J Sbornik. Mathematics %D 1972 %P 517-544 %V 16 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1972_16_4_a2/ %G en %F SM_1972_16_4_a2