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Soft-core Coulomb potentials and Heun’s differential equation
1.H. A. Bethe and E. E. Salpeter, Quantum Mechanics of One- and Two-Electron Atoms (Dover, New York, 1977).
2.M. Moshinsky, The Harmonic Oscillator in Modern Physics: From Atoms to Quarks (Gordon and Breach, London, 1969).
20.M. Reed and B. Simon, Methods of Modern Mathematical Physics II: Fourier Analysis and Self-Adjointness (Academic, New York, 1975) (The operator inequality is proved on p. 169.).
21.S. J. Gustafson and I. M. Sigal, Mathematical Concepts of Quantum Mechanics (Springer, New York, 2006) (The operator inequality is proved for dimensions on p. 32.).
38.F. M. Arscott, Periodic Differential Equations (Pergamon, Oxford, 1964). The result is a consequence of Lemma 1, p. 21.
40.P. P. Fiziev, J. Phys. A 43, 035203 (2010).
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