@article{DE_1982_18_3_a15,
     author = {N. D. Vasilevich},
     title = {Linear {Pfaffian} equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {520--523},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_3_a15/}
}