@article{EJDE_2008__2008__a49,
     author = {Berkane,  Ahmed},
     title = {Sufficient conditions for the oscillation of solutions to nonlinear second-order differential equations},
     journal = {Electronic journal of differential equations},
     year = {2008},
     volume = {2008},
     zbl = {1142.34328},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2008__2008__a49/}
}