@article{ref1,
title="Why do old people fall down?",
journal="Revista de Enfermeria",
year="1990",
author="Dorca Coll, A. and Céspedes Céspedes, T. and Prats Climent, B. and Dorca Coll, M. R.",
volume="13",
number="139",
pages="23-27",
abstract="<p>[Abstract unavailable]</p> <p>Language: es</p>",
language="es",
issn="0210-5020",
doi="",
url="http://dx.doi.org/"
}