1. Turing, A. M. Phil. Trans. R. Soc. B237, 37–72 (1952).
2. Kauffman, S. A. in Pattern Formation (eds Malacinsky, G. M. & Bryant, S.) 73–102 (Macmillan, New York, 1984).
3. Meinhardt, H. Models of Biological Pattern Formation (Academic, London, 1982).
4. Murray, J. D. Scient. Am. 258, 80–87 (1988).
5. Winfree, A. T. Nature 352, 568–569 (1991).