@article{ref1,
title="Tracheobronchial foreign bodies of unknown etiology",
journal="Annali di Laringologia, Otologia, Rinologia, Faringologia",
year="1968",
author="Bolla, A. and Scolari, R. and Forte, P. L.",
volume="67",
number="2",
pages="230-239",
abstract="<p>[Abstract unavailable]</p><p>Language: it</p>",
language="it",
issn="0066-2267",
doi="",
url="http://dx.doi.org/"
}