@article{EJDE_1997__1997__a27,
     author = {Chen,  Chao-Nien and Tzeng,  Shyuh-yaur},
     title = {Existence and multiplicity results for homoclinic orbits of {Hamiltonian} systems},
     journal = {Electronic journal of differential equations},
     year = {1997},
     volume = {1997},
     zbl = {0890.34040},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1997__1997__a27/}
}