@article{ref1,
title="Birth order and maternal age of psychiatric in-patients",
journal="British journal of psychiatry",
year="1966",
author="Tsuang, M. T.",
volume="112",
number="492",
pages="1131-1141",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0007-1250",
doi="",
url="http://dx.doi.org/"
}