@article{ref1,
title="Monitoring Traffic Speed and Volume",
journal="Traffic quarterly",
year="1959",
author="Ricker, ER",
volume="13",
number="1",
pages="128-128",
abstract="[Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="0041-0713",
doi="",
url="http://dx.doi.org/"
}