PACS numbers

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