@article{EJDE_2003__2003__a50,
     author = {Marcos do \'O,  Jo\~ao and Ubilla,  Pedro},
     title = {A multiplicity result for a class of superquadratic {Hamiltonian} systems},
     journal = {Electronic journal of differential equations},
     year = {2003},
     volume = {2003},
     zbl = {1034.35046},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a50/}
}