@article{ref1,
title="Multi-Objective Programming Approach for Routing Hazardous Materials",
journal="Journal of transportation engineering",
year="1989",
author="Zografos, Konstantinos G. and Davis, CF",
volume="115",
number="6",
pages="661-673",
abstract="[Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="0733-947X",
doi="",
url="http://dx.doi.org/"
}