1. Andrewartha, H. G. and Birch, L. C. (1954)The Distribution and Abundance of Animals. University of Chicago Press, Chicago, 782 pp.
2. Andrewartha, H. G. and Birch, L. C. (1984)The Ecological Web. University of Chicago Press, Chicago, 506 pp.
3. Botkin, D., Maguire, B., Moore III, B., Morowitz, H. J. and Slobodkin, L. B. (1979) A foundation for ecological theory. InBiological and Mathematical Aspects in Population Dynamics (R. de Bernardi, ed.).Mem. Ist. Ital. Idrobiol. Suppl. 37, 13–31.
4. Clements, F. E. and Shelford, V. E. (1939)Bio-Ecology. University Publishing Co., Lincoln, Nebraska, USA, 334 pp.
5. Cohen, J. (1971) Mathematics as metaphor.Science 172, 674–5.