Geodesic
Some specifically nonlinear oscillation theorems
Matematičeskie zametki, Tome 10 (1971) no. 2, pp. 129-134.

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Sufficient conditions are obtained for the oscillation of all infinitely continuable solutions of the equation $y''+a(x)f(y)=0$ for a wide class of nonlinearities; these conditions are not sufficient to establish the oscillation of solutions of $y''+a(x)y=0$. 
@article{MZM_1971_10_2_a1,
     author = {I. V. Kamenev},
     title = {Some specifically nonlinear oscillation theorems},
     journal = {Matemati\v{c}eskie zametki},
     pages = {129--134},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_10_2_a1/}
}
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I. V. Kamenev. Some specifically nonlinear oscillation theorems. Matematičeskie zametki, Tome 10 (1971) no. 2, pp. 129-134. http://geodesic.mathdoc.fr/item/MZM_1971_10_2_a1/