@article{BMMS_2012_35_3_a16,
     author = {Li Xiao},
     title = {Existence of {Periodic} {Solutions} for {Second} {Order} {Hamiltonian} {System}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2012},
     volume = {35},
     number = {3},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2012_35_3_a16/}
}