References
H. Hellmann, Einführung in die Quantenchemie, F. Deuticke, Leipzig, 1937;R. O. Feynman, Phys. Rev.,56, 340, 1939.
E. A. Hylleraas, Zs. f. Phys.,48, 469, 1928; ibid.,54, 347, 1929;E. A. Hylleraas andB. Undheim, ibid.,65, 759, 1930.
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Gáspár, R. The Hellmann-Feynman theorem in the variational method. Acta Phys. Hung. 16, 165–167 (1963). https://doi.org/10.1007/BF03156397
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DOI: https://doi.org/10.1007/BF03156397