@article{ref1,
title="Injuries of the trachea and bronchi",
journal="Thorax",
year="1972",
author="Bertelsen, S. and Howitz, P.",
volume="27",
number="2",
pages="188-194",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0040-6376",
doi="",
url="http://dx.doi.org/"
}