@article{ref1,
title="The tumbling bullet. A sign of retroperitoneal abscess",
journal="Radiology",
year="1970",
author="Mittelholzer, E. and Shields, J. B.",
volume="97",
number="3",
pages="625-627",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0033-8419",
doi="",
url="http://dx.doi.org/"
}