Rüdenberg, Klaus (1951). "A Study of Two‐Center Integrals Useful in Calculations on Molecular Structure. II. The Two‐Center Exchange Integrals". The Journal of Chemical Physics. 19 (12). AIP Publishing: 1459–1477. Bibcode:1951JChPh..19.1459R. doi:10.1063/1.1748101. ISSN0021-9606.
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Rüdenberg, Klaus (1951). "A Study of Two‐Center Integrals Useful in Calculations on Molecular Structure. II. The Two‐Center Exchange Integrals". The Journal of Chemical Physics. 19 (12). AIP Publishing: 1459–1477. Bibcode:1951JChPh..19.1459R. doi:10.1063/1.1748101. ISSN0021-9606.
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Rüdenberg, Klaus (1951). "A Study of Two‐Center Integrals Useful in Calculations on Molecular Structure. II. The Two‐Center Exchange Integrals". The Journal of Chemical Physics. 19 (12). AIP Publishing: 1459–1477. Bibcode:1951JChPh..19.1459R. doi:10.1063/1.1748101. ISSN0021-9606.