@article{ref1,
title="Extracranial causes of headache",
journal="Duodecim: Laaketieteellinen Aikakauskirja",
year="1976",
author="Fogelholm, R.",
volume="92",
number="7",
pages="360-365",
abstract="<p>[Abstract unavailable]</p><p>Language: fi</p>",
language="fi",
issn="0012-7183",
doi="",
url="http://dx.doi.org/"
}