1. Maynard Smith, J. The Evolution of Sex (Cambridge Univ. Press, 1978).
2. Michod, R. E. & Levin, B. R. The Evolution of Sex: An Examination of Current Ideas (Sinauer Associates, Massachusetts, 1988).
3. Bull, J. J. Evolution of Sex Determining Mechanisms. (Benjamin-Cummings, California, 1981).
4. Charlesworth, B. The evolution of chromosomal sex determination. Novartis Found. Symp. 244, 207–219 (2002).
5. Gurbich, T. A. & Bachtrog, D. Gene content evolution on the X chromosome. Curr. Opin. Genet. Dev. 18, 493–498 (2008).