@article{EJDE_1999__1999__a64,
     author = {Lee,  Cheng},
     title = {Infinitely many homoclinic orbits for {Hamiltonian} systems with group symmetries},
     journal = {Electronic journal of differential equations},
     year = {1999},
     volume = {1999},
     zbl = {0973.37039},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1999__1999__a64/}
}