with : Volker Roth

8th International Workshop on Cooperative Information Agents (CIA 2004) — 27/08/2004–29/08/2004

7th International Workshop on Cooperative Information Agents (CIA 2003) — 27/08/2003–29/08/2003

2nd International Conference on Autonomous Agents and Multiagent Systems (AAMAS 2003) — 14/07/2003–18/07/2003