@article{DE_1984_20_10_a23,
     author = {D. N. Kachevsky},
     title = {First integrals of a system of differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1819--1821},
     year = {1984},
     volume = {20},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_10_a23/}
}