1. Zuckerkandl, E. in Classification and Human Evolution (ed. Washburn, S.) 243-272 (Aldine, Chicago, 1963).
2. Cavalli-Sforza, L. L. Proc. R. Soc. Lond. 164, 362–379 (1966).
3. Cavalli-Sforza, L. L. et al. Cold Spring Harbor Symp. Quant. Biol. 51, 411–417 (1987).
4. Cavalli-Sforza, L. L., Menozzi, P. & Piazza, A. The History and Geography of Human Genes (Princeton Univ. Press, 1995).
5. Batzer, M. et al. J. Mol. Evol. 42, 22–29 (1996).