@article{ref1,
title="The prevention of crime",
journal="International journal of ethics (1890)",
year="1891",
author="Tonnies, Ferdinand",
volume="2",
number="1",
pages="51-77",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="1526-422X",
doi="",
url="http://dx.doi.org/"
}