@article{ref1,
title="The weekend increases sleep-related traffic accidents",
journal="Archives of physiology and biochemistry",
year="1999",
author="Kerkhof, G. A.",
volume="107",
number="2",
pages="136-137",
abstract="Abstract unavailable.",
language="",
issn="1381-3455",
doi="",
url="http://dx.doi.org/"
}