%0 Journal Article
%A A. B. Vasil'eva
%A V. A. Tupchiev
%T Periodic solutions of systems of differential equations with a small parameter at the derivatives, close to discontinuous ones
%J Doklady Akademii Nauk
%D 1968
%P 767-770
%V 178
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1968_178_4_a2/
%G ru
%F DAN_1968_178_4_a2