@article{ref1,
title="On an improved safety valve",
journal="Proceedings of the institution of mechanical engineers",
year="1856",
author="",
volume="7",
number="1",
pages="37-47",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0020-3483",
doi="10.1243/PIME_PROC_1856_007_009_02",
url="http://dx.doi.org/10.1243/PIME_PROC_1856_007_009_02"
}