%0 Journal Article
%A V. V. Yevstafyeva
%T On necessary conditions for existence of periodic solutions in a~dynamic system with discontinuous nonlinearity and an external periodic influence
%J Ufa mathematical journal
%D 2011
%P 19-26
%V 3
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/UFA_2011_3_2_a2/
%G en
%F UFA_2011_3_2_a2