@article{ref1,
title="Application of statistical sampling methods to traffic performance at urban intersections",
journal="Highway Research Board proceedings",
year="1946",
author="Greenshields, B.d.",
volume="",
number="",
pages="-",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0096-1027",
doi="",
url="http://dx.doi.org/"
}