@article{ref1,
title="Private security: Deterrent or diversion?",
journal="International review of law and economics",
year="1994",
author="Hui-Wen, Koo and Png, I.P.L.",
volume="14",
number="1",
pages="87-101",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0144-8188",
doi="10.1016/0144-8188(94)90038-8",
url="http://dx.doi.org/10.1016/0144-8188(94)90038-8"
}