@article{ref1,
title="Radiological cases of the month. Esophageal coins",
journal="Archives of pediatrics and adolescent medicine",
year="1994",
author="Dowd, M. D.",
volume="148",
number="4",
pages="423-424",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1072-4710",
doi="",
url="http://dx.doi.org/"
}