@article{ref1,
title="Severity and the stressor criterion in post-traumatic stress disorder",
journal="British journal of psychiatry",
year="1994",
author="Simpson, M. A.",
volume="164",
number="5",
pages="704-705",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0007-1250",
doi="",
url="http://dx.doi.org/"
}