@article{ref1,
title="Lighter gas and toy balloons",
journal="Ugeskrift for Laeger",
year="1993",
author="Thomsen, M.",
volume="155",
number="34",
pages="2636-2636",
abstract="<p>[Abstract unavailable]</p><p>Language: da</p>",
language="da",
issn="0041-5782",
doi="",
url="http://dx.doi.org/"
}