@article{ref1,
title="Historical aspects of foreign bodies in the air and food passages",
journal="Transactions and studies of the College of Physicians of Philadelphia",
year="1952",
author="Clerf, L. H.",
volume="20",
number="1",
pages="9-16",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0010-1087",
doi="",
url="http://dx.doi.org/"
}