@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 ``integrally small'' coefficient},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2141--2148},
     publisher = {mathdoc},
     volume = {13},
     number = {12},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_12_a3/}
}