Sanchez JJ, Monaghan G, Børsting C, Norbury G, Morling N, Gaspar HB (May 2007). "Carrier frequency of a nonsense mutation in the adenosine deaminase (ADA) gene implies a high incidence of ADA-deficient severe combined immunodeficiency (SCID) in Somalia and a single, common haplotype indicates common ancestry". Annals of Human Genetics. 71 (Pt 3): 336–347. doi:10.1111/j.1469-1809.2006.00338.x. PMID17181544.
Sanchez JJ, Monaghan G, Børsting C, Norbury G, Morling N, Gaspar HB (May 2007). "Carrier frequency of a nonsense mutation in the adenosine deaminase (ADA) gene implies a high incidence of ADA-deficient severe combined immunodeficiency (SCID) in Somalia and a single, common haplotype indicates common ancestry". Annals of Human Genetics. 71 (Pt 3): 336–347. doi:10.1111/j.1469-1809.2006.00338.x. PMID17181544.