@article{EJDE_2013__2013__a117,
     author = {Yang,  Jichen and Liu,  Anping and Liu,  Guangjie},
     title = {Oscillation of solutions to neutral nonlinear impulsive hyperbolic equations with several delays},
     journal = {Electronic journal of differential equations},
     year = {2013},
     volume = {2013},
     zbl = {1288.35025},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2013__2013__a117/}
}