@article{ref1,
title="Permiso a la muerte",
journal="Rev. colomb. reumatol",
year="2007",
author="Urbina Joiro, Hernán",
volume="14",
number="4",
pages="249-250",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0121-8123",
doi="",
url="http://dx.doi.org/"
}