%0 Journal Article
%A L. N. Karmov
%T The method of differentiation with respect to a parameter as applied to the problem of determining periodic solutions of differential equations
%J Differencialʹnye uravneniâ
%D 1970
%P 569-570
%V 6
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1970_6_3_a22/
%G ru
%F DE_1970_6_3_a22