@article{ref1,
title="Effect of environmental changes on health",
journal="Boletin de la Oficina Sanitaria Panamericana",
year="1972",
author="Chambers, L.",
volume="72",
number="4",
pages="286-315",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0030-0632",
doi="",
url="http://dx.doi.org/"
}