Guido Boella Harko Verhagen Leendert W. N. van der Torre 07122 Abstracts Collection - Normative Multi-agent Systems. 2007 conf/dagstuhl/2007P7122 Normative Multi-agent Systems http://drops.dagstuhl.de/opus/volltexte/2007/943 db/conf/dagstuhl/P7122.html#BoellaVT07