@article{ref1,
title="Hazard of yawning",
journal="CMAJ : Canadian Medical Association journal",
year="1990",
author="",
volume="142",
number="6",
pages="533-533",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0820-3946",
doi="",
url="http://dx.doi.org/"
}