Graf's Addition Theorem Obtained from $SO(3)$ Contraction
Teoretičeskaâ i matematičeskaâ fizika, Tome 129 (2001) no. 2, pp. 227-229

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We show that Graf's addition theorem for Bessel functions is obtained by contraction of the composition formula for $SO(3)$ rotations.
@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},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2001_129_2_a4/}
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P. Winternitz; K. B. Wolf; G. S. Pogosyan; G. S. Pogosyan; A. N. Sisakyan. Graf's Addition Theorem Obtained from $SO(3)$ Contraction. Teoretičeskaâ i matematičeskaâ fizika, Tome 129 (2001) no. 2, pp. 227-229. http://geodesic.mathdoc.fr/item/TMF_2001_129_2_a4/