@article{ref1,
title="Foreign bodies in the tracheobronchial tree and esophagus",
journal="Rocky Mountain medical journal",
year="1968",
author="Sparger, C. F.",
volume="65",
number="4",
pages="47-52",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0035-760X",
doi="",
url="http://dx.doi.org/"
}