@article{ref1,
title="Median lethal dose and its significance test",
journal="Salud publica de Mexico",
year="1971",
author="Bravo-Becherelle, M. A.",
volume="13",
number="2",
pages="213-216",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0036-3634",
doi="",
url="http://dx.doi.org/"
}