@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/}
}