Geodesic
Racah operators for principal
Sbornik. Mathematics, Tome 198 (2007) no. 3, pp. 369-381 Cet article a éte moissonné depuis la source Math-Net.Ru

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As a generalization of the well-known Racah coefficients (which are usually defined for finite-dimensional representations of semisimple Lie groups), the concept of Racah operators is introduced for locally compact groups with a ‘nice’ dual space. Explicit expressions for these operators are presented for $\operatorname{PSL}(2,\mathbb C)$. Bibliography: 8 titles. 
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R. S. Ismagilov. Racah operators for principal. Sbornik. Mathematics, Tome 198 (2007) no. 3, pp. 369-381. http://geodesic.mathdoc.fr/item/SM_2007_198_3_a2/

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