Iain Gourlay Karim Djemame James Padgett Evaluating Provider Reliability in Grid Resource Brokering. 36-43 2009 HPCC http://dx.doi.org/10.1109/HPCC.2009.95 conf/hpcc/2009 db/conf/hpcc/hpcc2009.html#GourlayDP09