1. (a) The colors of life: an introduction to the chemistry of porphyrins and related compounds. L. R. Milgrom, Oxford University Press, Oxford, (1997) pp. 1 − 249
2. (b) T. Mashiko, D. Dolphin, in Comprehensive Coordination Chemistry, S. G. Wilkinson (Ed.), Pergamon, Oxford, 2 (1987) 813 − 898.
3. K. M. Kadish, K. M. Smith, R. Guilard (Eds.), Academic Press, San Diego, Vol. 1-14 (2010)
4. Kazarin, O. N. Suvorova, Macroheterocycles, 5 (2012) 191 - 202
5. (c) B. Verreet, B. P. Rand, D. Cheyns, A. Hadipour, T. Aernouts, P. Heremans, A. Medina, C. G. Claessens, T. Torres, Adv. Energy Mater. 1 (2011) 565