1. Schiefenhövel W: Leid ohne Sinn? Krankheit, Schmerz und Tod. Entwurf einer evolutionären Medizin. Gesundheitswesen. 2000, 62: S3-S8.
2. Nesse RM, Williams GC: Why We Get Sick. The New Science of Darwinian Medicine. 1994, New York: Times Books
3. Darwin C: The Descent of Man, and Selection in Relation to Sex. 1871, London: Murray
4. Zahavi A: Mate selection - a selection for a handicap. J Theoret Biol. 1975, 53: 205-214. 10.1016/0022-5193(75)90111-3.
5. Fleagle JG: Primate locomotion and posture. The Cambridge Encyclopedia of Human Evolution. Edited by: Jones S, Martin R, Pilbeam D. 1992, Cambridge, UK: Cambridge University Press, 76-79.