Andrés García-Camino Juan A. Rodríguez-Aguilar Carles Sierra Wamberto Weber Vasconcelos Constraint rule-based programming of norms for electronic institutions. 186-217 2009 18 Autonomous Agents and Multi-Agent Systems 1 http://dx.doi.org/10.1007/s10458-008-9059-4 db/journals/aamas/aamas18.html#Garcia-CaminoRSV09