Stefania Costantini Arianna Tocchio Francesca Toni Panagiota Tsintza A Multi-layered General Agent Model. 121-132 2007 conf/aiia/2007 AI*IA http://dx.doi.org/10.1007/978-3-540-74782-6_12 db/conf/aiia/aiia2007.html#CostantiniTTT07