Dorian Gaertner Francesca Toni Preferences and Assumption-Based Argumentation for Conflict-Free Normative Agents. 94-113 2007 ArgMAS http://dx.doi.org/10.1007/978-3-540-78915-4_7 conf/argmas/2007 db/conf/argmas/argmas2007.html#GaertnerT07