@article{DE_1978_14_9_a8,
     author = {L. F. Yanchuk},
     title = {Stability of the zero solution of {Pfaffian} systems in terms of generalized characteristic vectors},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1606--1612},
     publisher = {mathdoc},
     volume = {14},
     number = {9},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_9_a8/}
}