@article{ref1,
title="On the economy of variable automatic expansion in steam engines",
journal="Proceedings of the institution of mechanical engineers",
year="1877",
author="Fell, John C.",
volume="28",
number="1",
pages="276-295",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0020-3483",
doi="10.1243/PIME_PROC_1877_028_020_02",
url="http://dx.doi.org/10.1243/PIME_PROC_1877_028_020_02"
}