1. Bonner, J.: Plant Biochemistry, p. 537. Academic Press, New York 1950
2. Bonner, J., Galston, A. W.: Principles of Plant Physiology. Freeman, San Francisco 1952
3. Brattsten, L. B.: Biochemical defense mechanisms in herbivores against plant biochemicals. In: Herbivores, their Interaction with Secondary Plant Metabolites, p. 202. Academic Press, New York 1979
4. Czapek, F.: Biochemie der Pflanzen, Vol. 3, p. 220. Fischer, Jena 1921
5. Demain, A. L.: Genetic regulation of fermentation organisms. Stadler Genet. Symp. 8, 41–55 (1976)