31.15.Md Perturbation theory
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A.V. Burenin “The ’chain of symmetry groups’ concept in the theory of molecular spectra” Phys. Usp. 36 (3) 177–187 (1993)
33.15.Bh, 31.15.Md, 33.20.Sn, 33.15.Kr, 31.15.Hz (all)
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N.B. Delone, M.V. Fedorov “New effects in the multiphoton ionization of atoms” Sov. Phys. Usp. 32 500–520 (1989)
32.80.Rm, 31.15.Md (all)
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A.V. Turbiner “The eigenvalue spectrum in quantum mechanics and the nonlinearization procedure” Sov. Phys. Usp. 27 668–694 (1984)
03.65.Fd, 03.65.Ge, 32.60.+i, 31.15.Ne, 31.15.Md (all)
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Ya.B. Zeldovich, V.S. Popov “Electronic structure of superheavy atoms” Sov. Phys. Usp. 14 673–694 (1972)
31.15.Md, 32.10.Dk, 36.10.Dr, 34.50.−s (all)
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