@article{ref1,
title="Police training for traffic control",
journal="Traffic quarterly",
year="1947",
author="Hoover, Johan Edgar",
volume="1",
number="4",
pages="301-311",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0041-0713",
doi="",
url="http://dx.doi.org/"
}