@article{ref1,
title="A previously unreported sign of foreign bodies in the trachea",
journal="Acta Radiologica",
year="1948",
author="Kjellberg, S. R.",
volume="29",
number="",
pages="300-302",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0001-6926",
doi="",
url="http://dx.doi.org/"
}