@article{DE_1974_10_2_a7,
     author = {I. V. Kamenev},
     title = {Oscillation criteria, connected with averaging, for the solutions of second order ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {246--252},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_2_a7/}
}