(en) Ryutaro Tsuchida, « Absorption Spectra of Co-ordination Compounds. I », Bulletin of the Chemical Society of Japan, vol. 13, no 5, , p. 388-400 (DOI10.1246/bcsj.13.388, lire en ligne)
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(en) Ryutaro Tsuchida, « Absorption Spectra of Co-ordination Compounds. I », Bulletin of the Chemical Society of Japan, vol. 13, no 5, , p. 388-400 (DOI10.1246/bcsj.13.388, lire en ligne)