Matthew Smith Michael Engel Thomas Friese Bernd Freisleben Gregory A. Koenig William Yurcik Security Issues in On-Demand Grid and Cluster Computing. 24 2006 conf/ccgrid/2006 CCGRID http://doi.ieeecomputersociety.org/10.1109/CCGRID.2006.164 db/conf/ccgrid/ccgrid2006.html#SmithEFFKY06