]> 2003-01-01T00:00:00-05:00 10.1007/978-3-540-45173-0\_8

Revised version of a paper originally resented at the Innovative Concepts for Agent-Based Systems, First International Workshop on Radical Agent Concepts, {WRAC} 2002, McLean, VA, USA, January 16-18, 2002/]]> 1657 217944