@article{TMF_2001_129_2_a4,
     author = {P. Winternitz and K. B. Wolf and G. S. Pogosyan and G. S. Pogosyan and A. N. Sisakyan},
     title = {Graf's {Addition} {Theorem} {Obtained} from $SO(3)$ {Contraction}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {227--229},
     publisher = {mathdoc},
     volume = {129},
     number = {2},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2001_129_2_a4/}
}