@article{ref1,
title="The problem of the amber signal light in traffic flow",
journal="Operations research",
year="1960",
author="Gazis, D and Herman, Robert and Maradudin, A",
volume="8",
number="1",
pages="112-132",
abstract="unavailable]  <p>Language: en</p>",
language="en",
issn="0030-364X",
doi="",
url="http://dx.doi.org/"
}