@techreport{EymannMatrosKoenig2008, author = {Torsten Eymann and Raimund Matros and Stefan K{\"o}nig}, title = {A Policy Framework including Trust and Reputation in Grid Environments}, institution = {Wirtschaftswissenschaften}, series = {Bayreuther Arbeitspapiere zur Wirtschaftsinformatik}, number = {25}, year = {2008} }