@article{ref1,
title="Foreign body in the urinary bladder of a four-year-old girl",
journal="Acta pediátrica Española",
year="1955",
author="Roviralta, E. and Ferrer-condal, J. M.",
volume="13",
number="154",
pages="823-825",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0001-6640",
doi="",
url="http://dx.doi.org/"
}