%0 Journal Article
%A L. Z. Fishman
%T The creation of a~periodic solution in systems of differential equations with lag
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1976
%P 96-107
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1976_12_a10/
%G ru
%F IVM_1976_12_a10