@article{ref1,
title="Accommodating billboards along roadsides",
journal="Transportation research record",
year="1981",
author="McInturff, George",
volume="805",
number="",
pages="18-18",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0361-1981",
doi="",
url="http://dx.doi.org/"
}