1. Bellows TS Jr (1981) The descriptive properties of some models for density dependence. J Anim Ecol 50:139?156
2. Caughley G (1976) Wildlife management and the dynamics of ungulate populations. Applied Biology 1:183?246
3. Caughley G (1977) Analysis of vertebrate populations. John Wiley and Sons, London New York Sydney Toronto
4. Caughley G, Lawton JH (1981) Plant-herbivore systems. In: May RM (ed) Theoretical Ecology, Second Edition. Black-well Scientific Publications, Oxford London Edinburgh Melbourne, p 132?166
5. Clark CW (1976) Mathematical bioeconomics. John Wiley and Sons, London New York Sydney Toronto