@article{EJDE_2011__2011__a23,
     author = {Luca,  Rodica},
     title = {Existence and uniqueness of solutions for a second-order nonlinear hyperbolic system},
     journal = {Electronic journal of differential equations},
     year = {2011},
     volume = {2011},
     zbl = {1227.35200},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a23/}
}