%0 Journal Article
%A V. F. Tkachev
%T New sufficient conditions for stability, semistability and instability of the limit cycle of the 

%J Doklady Akademii Nauk
%D 1957
%P 564-567
%V 116
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_116_4_a10/
%G ru
%F DAN_1957_116_4_a10