Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1985_21_11_a10, author = {O. V. Khramtsov}, title = {On the controllability of autonomous {Pfaffian} systems}, journal = {Differencialʹnye uravneni\^a}, pages = {1933--1939}, publisher = {mathdoc}, volume = {21}, number = {11}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1985_21_11_a10/} }
O. V. Khramtsov. On the controllability of autonomous Pfaffian systems. Differencialʹnye uravneniâ, Tome 21 (1985) no. 11, pp. 1933-1939. http://geodesic.mathdoc.fr/item/DE_1985_21_11_a10/