Programming Multi-Agent-Systems – Lecture Notes in Computer Science : 4411(Paperback) 4th International Workshop, ProMAS 2006, Hakodate, Japan, May 9, 2006, Revised and Invited Papers by R.H. Bordini (Editor) , M. Dastani (Editor) , Jurgen Dix (Editor) , A El Fallah Seghrouchni (Editor)