@article{ref1,
title="The relationship of headache occurrence to barometric pressure",
journal="International journal of biometeorology",
year="1980",
author="Schulman, J. and Leviton, A. and Slack, W. and Porter, D. and Graham, John R.",
volume="24",
number="3",
pages="263-269",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0020-7128",
doi="",
url="http://dx.doi.org/"
}