@article{ref1,
title="Shift sequences, duration of rest periods, and accident risk of bus drivers",
journal="Human factors",
year="1987",
author="van Nooten, W. N. and van Leeuwen, P. and Blom, D. H. and Pokorny, M. L.",
volume="29",
number="1",
pages="73-81",
abstract="Abstract unavailable.",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}