1. C. Darwin, On the Origin of Species by Means of Natural Selection (John Murray, London, 1859).
2. J. E. Cohen, Food Webs and Niche Space (Princeton Univ. Press, Princeton, NJ, 1978).
3. S. L. Pimm, Food Webs (Chapman & Hall, London, 1982).
4. G. Sugihara, thesis, Princeton University, Princeton, NJ, 1982.
5. Will a Large Complex System be Stable?