@article{ref1,
title="Safe work; dangerous free time",
journal="Journal of traffic medicine",
year="1976",
author="Wissfeld, H. J.",
volume="4",
number="1",
pages="17-18",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0345-5564",
doi="",
url="http://dx.doi.org/"
}