Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1965_161_3_a9, author = {B. V. Rusanov}, title = {Functionally invariant solutions of second-order equations}, journal = {Doklady Akademii Nauk}, pages = {534--537}, publisher = {mathdoc}, volume = {161}, number = {3}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1965_161_3_a9/} }
B. V. Rusanov. Functionally invariant solutions of second-order equations. Doklady Akademii Nauk, Tome 161 (1965) no. 3, pp. 534-537. http://geodesic.mathdoc.fr/item/DAN_1965_161_3_a9/