Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1975_222_6_a7, author = {L. V. Ovsyannikov}, title = {On differential invariants of a local {Lie} group of transformations}, journal = {Doklady Akademii Nauk}, pages = {1291--1294}, publisher = {mathdoc}, volume = {222}, number = {6}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1975_222_6_a7/} }
L. V. Ovsyannikov. On differential invariants of a local Lie group of transformations. Doklady Akademii Nauk, Tome 222 (1975) no. 6, pp. 1291-1294. http://geodesic.mathdoc.fr/item/DAN_1975_222_6_a7/