@article{ref1,
title="Walking Characteristics in Central Riyadh, Saudi Arabia",
journal="Journal of transportation engineering",
year="1988",
author="Koushki, Parviz A.",
volume="114",
number="6",
pages="735-744",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0733-947X",
doi="",
url="http://dx.doi.org/"
}