@inproceedings
	{
	BM08,
	author			=	"Piero A. Bonatti and Fabio Mogavero",
	title				=	"{Comparing Rule-Based Policies.}",
	booktitle		=	"9th IEEE Workshop on Policies for Distributed Systems and
								Networks (POLICY'08), 2-4 June 2008, Palisades, New York, USA",
	publisher		=	"IEEE Computer Society",
	isbn				=	"978-0-7695-3133-5",
	pages				=	"11-18",
	year				=	"2008"
	}