1. Alston, R., 1967: Biochemical systematics. In: Evolutionary biology (Dobzhansky, T. S., Hecht, M. K., and Steere, W. C., eds.), Vol. 1, 97–305. New York: Appleton-Century-Crofts.
2. Bowers, W. S., Ohta, T., Cleere, J.S., and Marsella, P.A., 1976: Discovery of insect anti-juvenile hormones in plants. Science 193, 542–547.
3. Cronquist, A., 1973: Chemical plant taxonomy: A generalist’s view of a promising specialty. Nobel Symposium 25, 29–39.
4. Dahlgren, R., 1975: A system of classification of the angiosperms to be used to demonstrate the distribution of characters. Bot. Notis. 128, 119–147.
5. Dobzhansky, T. S., 1941: Genetics and the origin of species. 2nd. ed. New York: Columbia University Press.