@article{ref1,
title="Automobile externalities and policies",
journal="Journal of economic literature",
year="2007",
author="Parry, Ian W. H. and Walls, Margaret and Harrington, Winston",
volume="45",
number="2",
pages="373-399",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0022-0515",
doi="10.1257/jel.45.2.373",
url="http://dx.doi.org/10.1257/jel.45.2.373"
}