1. Bittles, A. H. The role and significance of consanguinity as a demographic variable. Popul. Dev. Rev. 20, 561–584 (1994).
2. World Health Organization 1985 Advisory Group on Hereditary Diseases. Community approaches to the control of hereditary diseases. Unpublished WHO document: HMG/WG/85.10. Available at http://whqlibdoc.who.int/hq/1985-86/HDP_WG_85.10.pdf
3. Bittles, A. H. Consanguineous marriage: current global incidence and its relevance to demographic research. Research report no. 90-186 (Population Studies Center, University of Michigan, 1990). Data available at http://www.consang.net
4. Bittles, A. H. & Neel, J. A. The costs of human inbreeding and their implications for variations at the DNA level. Nature Genet. 8, 117–121 (1994).
5. Modell, B. in Culture, Kinship and Genes. Towards Cross-Cultural Genetics (eds Clarke, A. & Parsons, E.) 27–39 (Macmillan, Basingstoke, UK, 1997).