@article{EJDE_2014__2014__a12,
     author = {Zhang, Dan and Wu, Qinghua and Dai, Binxiang},
     title = {Existence and multiplicity of periodic solutions generated by impulses for second-order {Hamiltonian} system},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2014},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2014__2014__a12/}
}