1. Sex chromosomal anomalies: a possible association with leg ulcers;Andersen;Clin exp. Dermatol.,1979
2. The XXYY variant of Klinefelter's syndrome;Barr;Canad. med. Ass. J.,1964
3. Report of sex chromosome abnormalities in mentally retarded male offenders including a psychological study of patients with XYY and XXYY karyotypes;Beckmann;J. ment. Defic. Res.,1974
4. Aetiology and therapy of crural ulcers;Birger;Nord. Med.,1941
5. Do the 48, XXYY males have a characteristic phenotype?;Borgaonkar;Clin Genet.,1970