%0 Journal Article
%A A. T. Turaev
%T Certain methods of obtaining criteria for the existence and nonexistence of periodic solutions of a~differential equation
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1966
%P 129-133
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1966_4_a18/
%G ru
%F IVM_1966_4_a18