@article{DE_1989_25_9_a7,
     author = {G. S. Krechetov},
     title = {Lower and upper bounds for solutions of some classes of first-order differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1523--1526},
     publisher = {mathdoc},
     volume = {25},
     number = {9},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_9_a7/}
}