Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1995_31_6_a6, author = {N. N. Petrov}, title = {On a problem in {sub-Riemannian} geometry}, journal = {Differencialʹnye uravneni\^a}, pages = {973--979}, publisher = {mathdoc}, volume = {31}, number = {6}, year = {1995}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1995_31_6_a6/} }
N. N. Petrov. On a problem in sub-Riemannian geometry. Differencialʹnye uravneniâ, Tome 31 (1995) no. 6, pp. 973-979. http://geodesic.mathdoc.fr/item/DE_1995_31_6_a6/