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4. T. M. Makhviladze and L. A. Shelepin, Tr. FIAN SSSR,70, 120 (1973).
5. A. P. Yutsis, I. B. Levinson, and V. V. Vanagas, Mathematical Apparatus of the Theory of Angular Momentum, Jerusalem (1962): D. A. Varshalovich, A. N. Moskalev, and V. K. Khersonskii, Quantum Theory of Angular Momentum [in Russian], Nauka (1975).