1. Maynard-Smith, J. The Evolution of Sex (Cambridge Univ. Press, Cambridge, 1978).
2. Bell, G. The Masterpiece of Nature: The Evolution and Genetics of Sexuality (Univ. of California Press, Berkeley, 1982).
3. Andersson, M. Sexual Selection (Princeton Univ. Press, Princeton, 1994).
4. Trivers, R. L. in Sexual Selection and the Descent of Man (ed. Campbell, B. G.) 141 (Aldine, Chicago, 1972).
5. Arnold, S. J. & Wade, M. J. On the measurement of natural and sexual selection: applications. Evolution 38, 720–734 (1984).