@article{DE_1987_23_8_a4,
     author = {M. N. Popa and K. S. Sibirskii},
     title = {Conditions for the existence of a homogeneous linear partial integral of a differential system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1324--1331},
     publisher = {mathdoc},
     volume = {23},
     number = {8},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_8_a4/}
}