%0 Journal Article
%A M. N. Yakovlev
%T Existence of~$2^n$ periodic solutions of a system of~$n$ differential equations of first order
%J Zapiski Nauchnykh Seminarov POMI
%D 2002
%P 247-262
%V 284
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ZNSL_2002_284_a12/
%G ru
%F ZNSL_2002_284_a12