Martin J. Kollingbaum Timothy J. Norman Supervised Interaction - A Form of Contract Management to Create Trust between Agents. 108-122 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2631&spage=108 2002 conf/atal/2002lncs Trust, Reputation, and Security db/conf/atal/aamas2002lncs.html#KollingbaumN02a