@article{ref1,
title="The identification of extractor marks on fired shells",
journal="Journal of criminal law and criminology (1931-1951)",
year="1939",
author="Wilson, Charles M.",
volume="29",
number="5",
pages="724-730",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0885-2731",
doi="10.2307/1136860",
url="http://dx.doi.org/10.2307/1136860"
}