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Gilbert N. Lewis, M. Kasha: Phosphorescence and the Triplet State. In: Journal of the American Chemical Society. Band66, Nr.12, 1. Dezember 1944, ISSN0002-7863, S.2100–2116, doi:10.1021/ja01240a030.
Michael Kasha: The triplet state: An example of G. N. Lewis' research style. In: Journal of Chemical Education. Band61, Nr.3, 1. März 1984, ISSN0021-9584, S.204, doi:10.1021/ed061p204.
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Gilbert N. Lewis, M. Kasha: Phosphorescence and the Triplet State. In: Journal of the American Chemical Society. Band66, Nr.12, 1. Dezember 1944, ISSN0002-7863, S.2100–2116, doi:10.1021/ja01240a030.
Michael Kasha: The triplet state: An example of G. N. Lewis' research style. In: Journal of Chemical Education. Band61, Nr.3, 1. März 1984, ISSN0021-9584, S.204, doi:10.1021/ed061p204.