TY  - JOUR
AU  - Gu, Hua
AU  - An, Tianqing
TI  - Existence of infinitely many periodic solutions for second-order Hamiltonian systems
JO  - Electronic Journal of Differential Equations
PY  - 2013
VL  - 2013
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/EJDE_2013__2013__a94/
LA  - en
ID  - EJDE_2013__2013__a94
ER  -