中国科学院数学与系统科学研究院期刊网
NONTRIVIAL HOMOCLINIC ORBITS FOR SINGULAR SECOND ORDER PERIODIC HAMILTONIAN SYSTEMS NOT SATISFYING GORDON-STRONG FORCE CONDITION
Cheng Yue LI
Acta Mathematicae Applicatae Sinica . 2004, (2): 353 -360 .  DOI: 10.12387/C2004039