%0 Journal Article
%A A. N. Filatov
%T Averaging in systems of differential equations, unsolvable with respect to the derivative
%J Doklady Akademii Nauk
%D 1967
%P 795-797
%V 172
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1967_172_4_a12/
%G ru
%F DAN_1967_172_4_a12