@article{ref1,
title="Foreign bodies in the esophagus",
journal="American journal of surgery",
year="1957",
author="Jackson, C. L.",
volume="93",
number="2",
pages="308-312",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9610",
doi="",
url="http://dx.doi.org/"
}