Guido Boella Valerio Genovese Roberto Grenna Leendert van der Torre Merging Roles in Coordination and in Agent Deliberation. 62-73 2007 PRIMA http://dx.doi.org/10.1007/978-3-642-01639-4_6 conf/prima/2007 db/conf/prima/prima2007.html#BoellaGGT07