1. Hess, D.: Biochemische Genetik. Berlin-Heidelberg-New York: Springer 1968.
2. Hess, D.: Umschau64, 758 (1964);65, 49, 140 (1965).
3. Grisebach, H., in: Chemistry and Biochemistry of Plant Pigments. Ed. byT. W. Goodwin, S. 279. London: Academic Press 1965.
4. Grisebach, H.: Biosynthetic Patterns in Microorganisms and Higher Plants. S. 1. London: Wiley 1967.
5. Grisebach, H., in: Recent Adv. in Phytochem. Ed. byT. J Mabry et al. S. 379. New York: Appleton-Century-Crofts 1968.