@article{ref1,
title="Birth order and family size of Approved School boys",
journal="British journal of psychiatry",
year="1967",
author="Berg, I. and Fearnley, W. and Paterson, M. and Pollock, G. and Vallance, R.",
volume="113",
number="500",
pages="793-800",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0007-1250",
doi="",
url="http://dx.doi.org/"
}