@article{10_21136_CMJ_1986_102091,
     author = {Graef, John R. and Spikes, Paul W.},
     title = {On the oscillatory behavior of solutions of second order nonlinear differential equations},
     journal = {Czechoslovak Mathematical Journal},
     pages = {275--284},
     publisher = {mathdoc},
     volume = {36},
     number = {2},
     year = {1986},
     doi = {10.21136/CMJ.1986.102091},
     mrnumber = {831315},
     zbl = {0627.34034},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1986.102091/}
}