Ruey-Maw Chen Der-Fang Shiau Shih-Tang Lo Combined Discrete Particle Swarm Optimization and Simulated Annealing for Grid Computing Scheduling Problem. 242-251 2009 ICIC (2) http://dx.doi.org/10.1007/978-3-642-04020-7_26 conf/icic/2009-2 db/conf/icic/icic2009-2.html#ChenSL09