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Fischel-Ghodsian N, Nicholls RD, Higgs DR: Unusual features of CpG-rich (HTF) islands in the human alpha globin complex: association with non-functional pseudogenes and presence within the 3' portion of the zeta gene. In: Nucleic Acids Research. 15. Jahrgang, Nr.22, November 1987, S.9215–25, doi:10.1093/nar/15.22.9215, PMID 2825132, PMC 306463 (freier Volltext).