Elvis Papalilo Bernd Freisleben Managing Behaviour Trust in Grids Using Statistical Methods of Quality Assurance. 319-324 2007 IAS http://doi.ieeecomputersociety.org/10.1109/IAS.2007.57 conf/IEEEias/2007 db/conf/IEEEias/IEEEias2007.html#PapaliloF07