Periodic and Subharmonic Solutions for a Class of Local Nonquadratic Second-Order Hamiltonian Systems.

Qin Jiang Sheng Ma Periodic and Subharmonic Solutions for a Class of Local Nonquadratic Second-Order Hamiltonian Systems. 818-821 2008 CSSE (2) http://dx.doi.org/10.1109/CSSE.2008.1489 conf/csse/2008-2 db/conf/csse/csse2008-2.html#JiangM08