TY  - JOUR
AU  - Wei, Hui
AU  - Ji, Shuguan
TI  - Infinitely many periodic solutions for a semilinear wave equation with x-dependent coefficients
JO  - ESAIM: Control, Optimisation and Calculus of Variations
PY  - 2020
VL  - 26
PB  - EDP-Sciences
UR  - http://archive.numdam.org/articles/10.1051/cocv/2019007/
DO  - 10.1051/cocv/2019007
LA  - en
ID  - COCV_2020__26_1_A7_0
ER  -