@article{ref1,
title="Traffic signals in assignment",
journal="Transportation research part B: methodological",
year="1985",
author="Smith, M. J.",
volume="19",
number="2",
pages="155-160",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0191-2615",
doi="10.1016/0191-2615(85)90021-9",
url="http://dx.doi.org/10.1016/0191-2615(85)90021-9"
}