@article{EJDE_2004__2004__a122,
     author = {Fanelli, Luca and Lucente, Sandra},
     title = {The critical case for a semilinear weakly hyperbolic equation},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2004},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a122/}
}