Chihab Hanachi Christophe Sibertin-Blanc Protocol Moderators as Active Middle-Agents in Multi-Agent Systems. 131-164 2004 8 Autonomous Agents and Multi-Agent Systems 2 http://dx.doi.org/10.1023/B:AGNT.0000011159.53397.ea db/journals/aamas/aamas8.html#HanachiS04