@article{ref1,
title="An XXYY male presenting with aggression: a case report",
journal="South African medical journal SAMJ",
year="1977",
author="Bernstein, R. and Berman, I. W. and Nurse, G. T.",
volume="52",
number="20",
pages="809-812",
abstract="An abnormally tall 21-year-old Caucasoid male was referred for psychiatric assessment for pathological aggression and mental subnormality. He showed many of the phenotypic features of Klinefelter's syndrome. Cytogenetic studies revealed a 48,XXYY karyotype. The significance of the association of this karyotype with aggressive behaviour is discussed.<p /><p>Language: en</p>",
language="en",
issn="0038-2469",
doi="",
url="http://dx.doi.org/"
}