1. Comfort, A. The Biology of Senescence 3rd edn (Churchill Livingstone, Edinburgh and London, 1979).
2. Charlesworth, B. Evolution in Age-Structured Populations (Cambridge Univ. Press, Cambridge, 1980).
3. Finch, C. E. Longevity, Senescence and the Genome (University of Chicago Press, Chicago, 1990).
4. Rose, M. R. Evolutionary Biology of Ageing (Oxford Univ. Press, Oxford, 1991).
5. Bell, G. Sex and Death in the Protozoa (Cambridge Univ. Press, Cambridge. 1988).