@article{DAN_1969_187_1_a5,
     author = {N. H. Ibragimov},
     title = {Groups of generalized motions},
     journal = {Doklady Akademii Nauk},
     pages = {25--28},
     year = {1969},
     volume = {187},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_187_1_a5/}
}