Edoardo Pignotti Peter Edwards Alun D. Preece J. Gareth Polhill Nicholas Mark Gotts 840-847 2005 conf/ccgrid/2005 CCGRID http://doi.ieeecomputersociety.org/10.1109/CCGRID.2005.1558649 db/conf/ccgrid/ccgrid2005.html#PignottiEPPG05