@article{ref1,
title="Extracts of three letters: the one of M. Hugens, about a new invention of very exact and portative watches, serving to find the longitudes both at sea and land: the second, of  Dr. Swammerdam, touching an un-usual rupture of the mesentery: the third, cont",
journal="Philosophical transactions of the Royal Society of London (1665)",
year="1675",
author="de Zulichem, Christian Hugens and Swammerdam, Johannes and Lister, Martin",
volume="10",
number="112",
pages="272-279",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0370-2316",
doi="",
url="http://dx.doi.org/"
}