Simon Parsons Peter McBurney Elizabeth Sklar Michael Wooldridge On the Relevance of Utterances in Formal Inter-agent Dialogues. 47-62 2007 ArgMAS http://dx.doi.org/10.1007/978-3-540-78915-4_4 conf/argmas/2007 db/conf/argmas/argmas2007.html#ParsonsMSW07