%0 Journal Article
%A Li, Zhanyong
%A Liu, Qihuai
%A Zhang, Kelei
%T Periodic solutions of nonlinear differential systems by the method of averaging
%J Applications of Mathematics
%D 2020
%P 511-542
%V 65
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.21136/AM.2020.0006-19/
%R 10.21136/AM.2020.0006-19
%G en
%F 10_21136_AM_2020_0006_19