@article{ref1,
title="Control of the gases in automobile exhaust",
journal="Salud publica de Mexico",
year="1977",
author="",
volume="19",
number="1",
pages="69-73",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0036-3634",
doi="",
url="http://dx.doi.org/"
}