%0 Journal Article
%A L. S. Pontryagin
%A L. V. Rodygin
%T Approximate solution of a system of ordinary differential equations involving a small parameter in the derivatives
%J Doklady Akademii Nauk
%D 1960
%P 255-258
%V 131
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1960_131_2_a9/
%G ru
%F DAN_1960_131_2_a9