@article{ref1,
title="Physical and personality characteristics in cluster headache",
journal="Headache",
year="1974",
author="Kudrow, L.",
volume="13",
number="4",
pages="197-202",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0017-8748",
doi="",
url="http://dx.doi.org/"
}