@article{ref1,
title="Complications of retropneumoperitoneum using carbon dioxide as insufflation gas",
journal="Radiologe, Der",
year="1972",
author="Metzler, R. and Habighorst, L. V. and Diethelm, L.",
volume="12",
number="11",
pages="367-371",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0033-832X",
doi="",
url="http://dx.doi.org/"
}