Helmut Kneer Henrik Stormer Harald Häuschen Burkhard Stiller An Agent-Based Framework for Monitoring Service Contracts. 139-151 2002 conf/ecweb/2002 EC-Web http://link.springer.de/link/service/series/0558/bibs/2455/24550139.htm db/conf/ecweb/ecweb2002.html#KneerSHS02