Iyad Rahwan Simon Parsons Chris Reed Argumentation in Multi-Agent Systems, 4th International Workshop, ArgMAS 2007, Honolulu, HI, USA, May 15, 2007, Revised Selected and Invited Papers 4946 2008 978-3-540-78914-7 ArgMAS Lecture Notes in Computer Science Springer db/conf/argmas/argmas2007.html