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O'Leary, B., Mallion, R.B. Walsh diagrams and the Hellmann-Feynman theorem: A tribute to the late Professor Charles A. Coulson, F.R.S. (1910–1974). J Math Chem 1, 335–344 (1987). https://doi.org/10.1007/BF01205066
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DOI: https://doi.org/10.1007/BF01205066