1. L. R. Milgrom, The Colours of Life, Oxford University Press, Oxford, 1997.
2. F.-P. Montforts, B. Gerlach, and F. Hoper, Chem. Rev., 1994, 94, 327.
3. V. Ya. Bykhovskii, in Uspekhi khimii porfirinov [Advances in Porphyrin Chemistry], Ed. O. A. Golubchikov, Izd-vo NII Khim. SPbGU, S.-Peterburg, 1997, vol. 1, 27 (in Russian).
4. G. Britton, The Biochemistry of Natural Pigments, Cambridge University Press, Cambridge, 1983.
5. Khimiya biologicheski aktivnykh prirodnykh soedinenii [The Chemistry of Biologically Active Natural Compounds], Ed. N. A. Preobrazhensky, R. P. Evstigneeva, Khimiya, Moscow, 1976, 512 pp. (in Russian).