Iyad Rahwan Philippe Pasquier Liz Sonenberg Frank Dignum On the Benefits of Exploiting Hierarchical Goals in Bilateral Automated Negotiation. 18-30 2007 ArgMAS http://dx.doi.org/10.1007/978-3-540-78915-4_2 conf/argmas/2007 db/conf/argmas/argmas2007.html#RahwanPSD07