Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1993_330_1_a6, author = {V. E. Shemarulin}, title = {Higher symmetry algebra structure and local equivalences of {Euler--Darboux} equations}, journal = {Doklady Akademii Nauk}, pages = {24--27}, publisher = {mathdoc}, volume = {330}, number = {1}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1993_330_1_a6/} }
V. E. Shemarulin. Higher symmetry algebra structure and local equivalences of Euler--Darboux equations. Doklady Akademii Nauk, Tome 330 (1993) no. 1, pp. 24-27. http://geodesic.mathdoc.fr/item/DAN_1993_330_1_a6/