@article{DE_1986_22_5_a25,
     author = {P. G. Lasy},
     title = {A linear completely integrable {Pfaffian} equation having a given characteristic set},
     journal = {Differencialʹnye uravneni\^a},
     pages = {896--897},
     publisher = {mathdoc},
     volume = {22},
     number = {5},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_5_a25/}
}