@article{ref1,
title="The case-crossover study: a novel design in evaluating transient fatigue as a risk factor for road traffic accidents",
journal="Sleep",
year="2010",
author="Lombardi, David A.",
volume="33",
number="3",
pages="283-284",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0161-8105",
doi="",
url="http://dx.doi.org/"
}