@article{ref1,
title="On the invention and use of gunpowder and firearms in China",
journal="Isis; an international review devoted to the history of science and its cultural influences",
year="1947",
author="Ling, Wang",
volume="37",
number="3/4",
pages="160-178",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0021-1753",
doi="10.2307/225569",
url="http://dx.doi.org/10.2307/225569"
}