@article{ref1,
title="Evaluation of duct opening protection in two-hour fire walls and partitions",
journal="Fire technology",
year="1991",
author="Gewain, Richard G. and Shanley, James H. and DiNenno, Philip J. and Scheffey, Joseph L. and Campbell, Bruce G.",
volume="27",
number="3",
pages="204-218",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0015-2684",
doi="10.1007/BF01038447",
url="http://dx.doi.org/10.1007/BF01038447"
}