@article{ref1,
title="Shifts, duration of work and accident risk of bus drivers",
journal="Ergonomics",
year="1987",
author="Pokorny, M. L. and Blom, D. H. and van Leeuwen, P.",
volume="30",
number="1",
pages="61-88",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}