@article{EJDE_2005__2005__a6,
     author = {Voisei,  Mircea D.},
     title = {Periodic trajectories for evolution equations in {Banach} spaces},
     journal = {Electronic journal of differential equations},
     year = {2005},
     volume = {2005},
     zbl = {1095.47054},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2005__2005__a6/}
}