1. K. M. Smith (Ed.),Porphyrins and Metalloporphyrins, Elsevier, New York, 1975.
2. W. Schneider,Struct. Bonding (Berlin) 1975,23, 123.
3. P. Hambright, Chapt. 6 in [1].
4. F. R. Longo, E. M. Brown, W. G. Row, A. D. Adler,The Porphyrins, Vol. 5, Chapt. 10 (D. Dolphin, ed.), Academic Press, New York, 1978.
5. M. Tanaka,Pure Appl. Chem. 1983,55, 151.