@article{TMF_1970_4_1_a7,
     author = {A. M. Perelomov and V. S. Popov},
     title = {``Fall to the center'' in quantum mechanics},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {48--65},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1970_4_1_a7/}
}