Nicola Dragoni Fault tolerant knowledge level inter-agent communication in open Multi-Agent Systems. 385-387 2006 19 AI Commun. 4 http://iospress.metapress.com/openurl.asp?genre=article&issn=0921-7126&volume=19&issue=4&spage=385 db/journals/aicom/aicom19.html#Dragoni06