Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1958_118_3_a5, author = {L. V. Ovsyannikov}, title = {Groups and invariant-group solutions of differential equations}, journal = {Doklady Akademii Nauk}, pages = {439--442}, publisher = {mathdoc}, volume = {118}, number = {3}, year = {1958}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1958_118_3_a5/} }
L. V. Ovsyannikov. Groups and invariant-group solutions of differential equations. Doklady Akademii Nauk, Tome 118 (1958) no. 3, pp. 439-442. http://geodesic.mathdoc.fr/item/DAN_1958_118_3_a5/