@article{ref1,
title="Survey of uphill speeds of trucks on mountain grades",
journal="Highway Research Board proceedings",
year="1949",
author="Willey, W.e.",
volume="",
number="",
pages="-",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0096-1027",
doi="",
url="http://dx.doi.org/"
}