1. Allport, O. C., and J. D. Bu’lock: The Pigmentation and Cell-wall Material of Daldinia Sp. J. Chem. Soc. (London), 4090 (1958).
2. Bagnar A, J. T., and M. E. Hadley: Chromatophores and Color Change. New Jersey: Prentice-Hall. 1973.
3. Baird, D. B., and I. Baxter: Private communication.
4. Barden, H.: The Histochemical Relationship of Neuromelanin and Lipofuscin. J. Neuropathol. and Exptl. Neurology 28, 419 (1969).
5. Barden, H., and E. Martin: Electron Probe Microanalysis of Neuromelanin and Lipofuscin. In: V. Riley (Ed.): Pigmentation, its Genesis and Biological Control, p. 631. New York: Appleton-Century-Crofts. 1972.