@article{ref1,
title="Radiopacity of glass",
journal="AJR American journal of roentgenology",
year="1988",
author="Patz, E. F.",
volume="150",
number="2",
pages="472-472",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0361-803X",
doi="10.2214/ajr.150.2.472-a",
url="http://dx.doi.org/10.2214/ajr.150.2.472-a"
}