@article{ref1,
title="Foreign bodies in the bladder",
journal="Zeitschrift für Urologie",
year="1959",
author="Steffens-krebs, D.",
volume="52",
number="4",
pages="259-261",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0863-0267",
doi="",
url="http://dx.doi.org/"
}