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Brown, G. M., Hopf, F. R., Ferguson, J. A., Meyer, T. J., & Whitten, D. G. (1973). Metalloporphyrin redox chemistry. Effect of extraplanar ligands on the site of oxidation in ruthenium porphyrins. Journal of the American Chemical Society, 95(18), 5939–5942. doi:10.1021/ja00799a018 
10.1021/ja00799a018