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Edwards, L.; Dolphin, D.H.; Gouterman, M.; Adler, A.D., Porphyrins XVII. Vapor absorption spectra and redox reactions: Tetraphenylporphins and porphin, Journal of Molecular Spectroscopy, 1971, 38, 1, 16-32, https://doi.org/10.1016/0022-2852(71)90090-7 . [all data]