@article{ref1,
title="Most frequent causes of preschool mortality",
journal="Revista de sanidad e higiene publica",
year="1967",
author="Blanco Otero, M.",
volume="41",
number="7",
pages="198-218",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0034-8899",
doi="",
url="http://dx.doi.org/"
}