@article{EJDE_2004__2004__a191,
     author = {Wang,  Peiguang and Wu,  Yonghong},
     title = {Oscillation of solutions for systems of hyperbolic equations of neutral type},
     journal = {Electronic journal of differential equations},
     year = {2004},
     volume = {2004},
     zbl = {1061.35156},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a191/}
}