Geodesic
The zeros of the oscillatory solutions of the equation $(p(t)x')'+f(t,$ $x,$ $x')=0$
Differencialʹnye uravneniâ, Tome 12 (1976) no. 4, pp. 621-625.

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     author = {M. Bartushek},
     title = {The zeros of the oscillatory solutions of the equation $(p(t)x')'+f(t,$ $x,$ $x')=0$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {621--625},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_4_a4/}
}
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M. Bartushek. The zeros of the oscillatory solutions of the equation $(p(t)x')'+f(t,$ $x,$ $x')=0$. Differencialʹnye uravneniâ, Tome 12 (1976) no. 4, pp. 621-625. http://geodesic.mathdoc.fr/item/DE_1976_12_4_a4/