Alessandro Ricci Michele Piunti Mirko Viroli Externalisation and Internalization: A New Perspective on Agent Modularisation in Multi-Agent System Programming. 35-54 2009 LADS http://dx.doi.org/10.1007/978-3-642-13338-1_3 conf/lads/2009 db/conf/lads/lads2009.html#RicciPV09