@article{EJDE_2015__2015__a84,
     author = {Timoumi, Mohsen},
     title = {Existence of periodic solutions for sub-linear first-order {Hamiltonian} systems},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2015},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2015__2015__a84/}
}