@InProceedings{MayGLZ09,
  author =  {Michael J. May and Carl A. Gunter and Insup Lee and Steve Zdanceic},
  title =    {Strong and Weak Policy Relations},
  booktitle =	{IEEE Symposium on Policies for Distributed Systems and Networks ({POLICY} '09)},
  year =    2009,
  address = {London},
  month =   {July},
}