Geodesic
On the question of the oscillation of the solutions of a second order differential equation with an “integrally small” coefficient
Differencialʹnye uravneniâ, Tome 13 (1977) no. 12, pp. 2141-2148 
I. V. Kamenev. On the question of the oscillation of the solutions of a second order differential equation with an “integrally small” coefficient. Differencialʹnye uravneniâ, Tome 13 (1977) no. 12, pp. 2141-2148. http://geodesic.mathdoc.fr/item/DE_1977_13_12_a3/
@article{DE_1977_13_12_a3,
     author = {I. V. Kamenev},
     title = {On the question of the oscillation of the solutions of a second order differential equation with an {\textquotedblleft}integrally small{\textquotedblright} coefficient},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2141--2148},
     year = {1977},
     volume = {13},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_12_a3/}
}
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