@article{DE_1972_8_5_a5,
     author = {A. G. Katranov},
     title = {On the question of the asymptotic behavior of oscillatory solutions of a second order nonlinear differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {785--789},
     publisher = {mathdoc},
     volume = {8},
     number = {5},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_5_a5/}
}