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@article{DAN_1968_183_2_a6, author = {N. H. Ibragimov}, title = {On the group classification of second order differential equations}, journal = {Doklady Akademii Nauk}, pages = {274--277}, publisher = {mathdoc}, volume = {183}, number = {2}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1968_183_2_a6/} }
N. H. Ibragimov. On the group classification of second order differential equations. Doklady Akademii Nauk, Tome 183 (1968) no. 2, pp. 274-277. http://geodesic.mathdoc.fr/item/DAN_1968_183_2_a6/