@article{ref1,
title="When the Crips invaded San Francisco -- gang migration",
journal="Gang journal",
year="1994",
author="Waldorf, Dan",
volume="1",
number="4",
pages="11-16",
abstract="<p>[Abstract unavailable]</p>  <p>Keywords: Juvenile justice</p>",
language="en",
issn="1061-5326",
doi="",
url="http://dx.doi.org/"
}