@article{DE_1987_23_2_a0,
     author = {M. Bartushek},
     title = {On the properties of oscillating solutions of ordinary differential inequalities and equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {187--191},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_2_a0/}
}