%0 Journal Article
%A E. K. Ershov
%T Dependence on a parameter of the rotation number of a differential equation defined on the torus
%J Differencialʹnye uravneniâ
%D 1975
%P 1774-1779
%V 11
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1975_11_10_a5/
%G ru
%F DE_1975_11_10_a5