Geodesic
The zeros of the oscillatory solutions of the equation $x''+a(t)f(x)=0$
Differencialʹnye uravneniâ, Tome 7 (1971) no. 5, pp. 930-933.

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     author = {A. G. Katranov},
     title = {The zeros of the oscillatory solutions of the equation $x''+a(t)f(x)=0$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {930--933},
     publisher = {mathdoc},
     volume = {7},
     number = {5},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_5_a16/}
}
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A. G. Katranov. The zeros of the oscillatory solutions of the equation $x''+a(t)f(x)=0$. Differencialʹnye uravneniâ, Tome 7 (1971) no. 5, pp. 930-933. http://geodesic.mathdoc.fr/item/DE_1971_7_5_a16/