@article{ref1,
title="Mortality from traffic accidents among motorcyclists or caused by them. Federal District Mexico",
journal="Salud publica de Mexico",
year="1981",
author="Olivares Urbina, C.",
volume="23",
number="3",
pages="219-244",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0036-3634",
doi="",
url="http://dx.doi.org/"
}