TY  - JOUR
AU  - Li, Zhanyong
AU  - Liu, Qihuai
AU  - Zhang, Kelei
TI  - Periodic solutions of nonlinear differential systems by the method of averaging
JO  - Applications of Mathematics
PY  - 2020
SP  - 511
EP  - 542
VL  - 65
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/AM.2020.0006-19/
DO  - 10.21136/AM.2020.0006-19
LA  - en
ID  - 10_21136_AM_2020_0006_19
ER  -