@article{DE_1978_14_2_a4,
     author = {A. I. Perov and Yu. V. Trubnikov},
     title = {Monotone differential {equations.~III}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {232--244},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_2_a4/}
}