@article{ref1,
title="The Development of of the Powder Weapon",
journal="Naturwissenschaften",
year="1940",
author="Kunze, P.",
volume="28",
number="",
pages="677-685",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0028-1042",
doi="",
url="http://dx.doi.org/"
}