TY  - JOUR
AU  - Zhang, Qiongfen
AU  - Tang, X. H.
TI  - Periodic solutions for second order Hamiltonian systems
JO  - Applications of Mathematics
PY  - 2012
SP  - 407
EP  - 425
VL  - 57
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.1007/s10492-012-0024-9/
DO  - 10.1007/s10492-012-0024-9
LA  - en
ID  - 10_1007_s10492_012_0024_9
ER  -