Rajkumar Buyya Anthony Sulistio Service and Utility Oriented Distributed Computing Systems: Challenges and Opportunities for Modeling and Simulation Communities. 68-81 2008 Annual Simulation Symposium http://doi.ieeecomputersociety.org/10.1109/ANSS-41.2008.35 conf/anss/2008 db/conf/anss/anss2008.html#BuyyaS08