%0 Journal Article
%A A. V. Pokrovskii
%A M. A. Krasnosel'skii
%T Periodic oscillations in systems with relay nonlinearities
%J Doklady Akademii Nauk
%D 1974
%P 733-736
%V 216
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1974_216_4_a6/
%G ru
%F DAN_1974_216_4_a6