@article{ref1,
title="Uncommon cases of foreign bodies in the esophagus--duplex coins",
journal="Acta medicinae Okayama",
year="1970",
author="Ogura, Y. and Tasaka, S.",
volume="24",
number="4",
pages="483-487",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-6152",
doi="",
url="http://dx.doi.org/"
}