@article{EJDE_2011__2011__a40,
     author = {Shoukaku,  Yutaka},
     title = {Oscillation of solutions for forced nonlinear neutral hyperbolic equations with functional arguments},
     journal = {Electronic journal of differential equations},
     year = {2011},
     volume = {2011},
     zbl = {1217.35202},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a40/}
}