@article{ref1,
title="An algebraic procedure for estimating health services demand after the earthquakes",
journal="Salud publica de Mexico",
year="1987",
author="Campos, M. A. P. and González Block, M. A. and Jiménez, J.",
volume="29",
number="5",
pages="421-441",
abstract="<p>[Abstract unavailable]</p> <p>Language: es</p>",
language="es",
issn="0036-3634",
doi="",
url="http://dx.doi.org/"
}