@article{ref1,
title="The XYY syndrome: a study of four subjects and their families",
journal="Psychological medicine",
year="1974",
author="Pitcher, D. R. and Macfie, A. M. and Carter, W. I. and Kahn, J.",
volume="4",
number="1",
pages="38-56",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0033-2917",
doi="",
url="http://dx.doi.org/"
}