1. Comfort, A. (1979) The Biology of Senescence, Churchill Livingstone, Edinburgh–London.
2. Finch, C. E. (1990) Longevity, Senescence and the Genome, University Chicago Press, Chicago.
3. Medawar, P. B. (1952) An Unsolved Problem of Biology, H. K. Lewis, London.
4. Williams, G. C. (1957) Pleiotropy, natural selection and the evolution of senescence, Evolution, 11, 398–411.
5. Kirkwood, T. B. L. (1977) Evolution of ageing, Nature, 270, 301–304.