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Heitler, Walter; London, Fritz (1927). “Wechselwirkung neutraler Atome und homöopolare Bindung nach der Quantenmechanik”. Zeitschrift für Physik44 (6–7): 455–472. Bibcode: 1927ZPhy...44..455H. doi:10.1007/BF01397394.
Seymour H. Mauskopf (1969). “The Atomic Structural Theories of Ampère and Gaudin: Molecular Speculation and Avogadro's Hypothesis”. Isis60 (1): 61–74. doi:10.1086/350449. JSTOR229022.
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