@article{ref1,
title="Weekly headache periodicity and the effect of weather changes on headache",
journal="International journal of biometeorology",
year="1981",
author="Osterman, P. O. and Lövstrand, K. G. and Lundberg, P. O. and Lundquist, S. and Muhr, C.",
volume="25",
number="1",
pages="39-45",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0020-7128",
doi="",
url="http://dx.doi.org/"
}