@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},
     publisher = {mathdoc},
     volume = {2003},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a50/}
}