Jie Jiang 0004 John Thangarajah Huib Aldewereld Virginia Dignum Reasoning with agent preferences in normative multi-agent systems. 1373-1374 2014 AAMAS http://dl.acm.org/citation.cfm?id=2617479 conf/atal/2014 db/conf/atal/aamas2014.html#JiangTAD14