1. Aschoff, J. (ed.): Handbook of Behavioural Neurobiology, Vol. 4, p. 475. New York-London: Plenum 1981
2. Betzig, L., Borgerhoff Mulder, M., Turke, P. (eds.): Human Reproductive Behaviour ? A Darwinian Perspective. Cambridge Univ. Press 1988
3. Enlow, D. H.: Principles of Bone Remodeling. Springfield, Ill.: Thomas 1963
4. Grupe, G., Bach, H.: Anthropol. Anz.51, 317 (1993)
5. Jowsey, J., in: Biological Mineralization, Vol. 1, p. 297 (I. Zipkin, ed.). New York-London: Wiley 1973