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Additional information
Institute of Theoretical Physics, Academy of Sciences of the Ukrainian SSR. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 13, No. 3, pp. 327–342, December, 1972.
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Klimyk, A.U. The Wigner-Eckart theorem and covariant operators. Theor Math Phys 13, 1171–1181 (1972). https://doi.org/10.1007/BF01036141
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DOI: https://doi.org/10.1007/BF01036141