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2. Rose, M. E.: Elementary theory of angular momentum. John Wiley 1957
3. Wigner, E. P.: Group theory and its application to the quantum mechanics of atomic spectra. Academic Press 1959
4. Fano, U., Racah, G.: Irreducible tensorial sets. Academic Press 1959
5. Condon, E. U., Shortley, G. H.: The theory of atomic spectra. Cambridge University Press 1935