1. Alligood, K.T., Sauer, T.D., Yorke, J.A.: Chaos: An Introduction to Dynamical Systems. (Springer Press: New York 1996)
2. Beldade, P., Brakefield, P.M.: Nature Reviews Genetics. 3, 442 (2002), e-site at: wwwbio.leidenuniv.nl/~eew/G3/s2.html
3. Boyajian, G., Lutz, T.: Geology. 20, 983 (1992)
4. Campbell, N.A.: Biology. 3th ed. (Benjamin-Cummings Publishing: California 1993)
5. Carroll, S.B. Grenier, J.K., Weatherbee, S.D.: From DNA to Diversity: Molecular Genetics and the Evolution of Animal Design. (Blackwell Scientific, Malden, Mass. 2001); Guss, K.A., Nelson, C.E., Hudson, A., Kraus, M.E., and Carroll, S.B., Science, 292, 1164 (2001)