1. Dickenson, R.L. Human Sex Anatomy (R.E. Krieger Publishing Co., Huntington, New York, 1949).
2. Laqueur, T. Making Sex (Harvard Univ. Press, Cambridge, Massachusetts, 1990).
3. Halpern, D.F. Sex Differences in Cognitive Abilities, 2nd edn. (Lawrence Erlbaum Assoc., Hillsdale, New Jersey, 1992).
4. Irigaray, L. An Ethics of Sexual Difference (Althone Press, London, 1993).
5. Fillingim, R.B. & Maixner, W. Gender differences in the responses to noxious stimuli. Pain Forum 4, 209–221 (1995).