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@article{DAN_1963_148_1_a7, author = {L. V. Ovsyannikov}, title = {Infinite groups of mappings defined by differential equations}, journal = {Doklady Akademii Nauk}, pages = {36--39}, publisher = {mathdoc}, volume = {148}, number = {1}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1963_148_1_a7/} }
L. V. Ovsyannikov. Infinite groups of mappings defined by differential equations. Doklady Akademii Nauk, Tome 148 (1963) no. 1, pp. 36-39. http://geodesic.mathdoc.fr/item/DAN_1963_148_1_a7/