Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1994_30_5_a3, author = {N. N. Petrov}, title = {Shortest {sub-Riemannian} geodesics}, journal = {Differencialʹnye uravneni\^a}, pages = {768--775}, publisher = {mathdoc}, volume = {30}, number = {5}, year = {1994}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1994_30_5_a3/} }
N. N. Petrov. Shortest sub-Riemannian geodesics. Differencialʹnye uravneniâ, Tome 30 (1994) no. 5, pp. 768-775. http://geodesic.mathdoc.fr/item/DE_1994_30_5_a3/