@article{ref1,
title="Road Traffic Signals",
journal="British medical journal: BMJ",
year="1932",
author="Harman, NB",
volume="1",
number="3718",
pages="682-682",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}