@article{DE_1968_4_7_a1,
     author = {A. V. Kostin},
     title = {The asymptotic properties of solutions of first order ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1184--1195},
     year = {1968},
     volume = {4},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_7_a1/}
}