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L. V. Kirenski Institute of Physics, Siberian Branch, USSR Academy of Sciences. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 76, No. 1, pp. 143–152, July, 1988.
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Val'kov, V.V. Unitary transformations of the group U(N) and diagonalization of multilevel Hamiltonians. Theor Math Phys 76, 766–772 (1988). https://doi.org/10.1007/BF01029435
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DOI: https://doi.org/10.1007/BF01029435