@article{DAN_1968_181_2_a16,
     author = {A. M. Perelomov and V. S. Popov},
     title = {``Latent'' symmetry of {Kepler's} relativistic problem},
     journal = {Doklady Akademii Nauk},
     pages = {320--323},
     publisher = {mathdoc},
     volume = {181},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_181_2_a16/}
}