@article{ref1,
title="Penetrating foreign body of maxillary antrum",
journal="New York state journal of medicine",
year="1974",
author="Nicolas, F. and Berger, W. and Levowitz, B. S.",
volume="74",
number="11",
pages="2027-2028",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0028-7628",
doi="",
url="http://dx.doi.org/"
}