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Carbó, R., Besalú, E. Definition and quantum chemical applications of nested summation symbols and logical functions: Pedagogical artificial intelligence devices for formulae writing, sequential programming and automatic parallel implementation. J Math Chem 18, 37–72 (1995). https://doi.org/10.1007/BF01166602
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DOI: https://doi.org/10.1007/BF01166602