@article{ref1,
title="An evaluation of congestion pricing policy in Seoul: a case study",
journal="IATSS research",
year="1997",
author="Kim, Sungyop and Oh, Juhwan and Kim, Wonchul",
volume="21",
number="1",
pages="90-96",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0386-1112",
doi="",
url="http://dx.doi.org/"
}