Eric Angel Evripidis Bampis Fanny Pascual Alex-Ariel Tchetgnia On the truthfulness and the approximation for scheduling selfish tasks. 196-197 2007 conf/spaa/2007 SPAA http://doi.acm.org/10.1145/1248377.1248410 db/conf/spaa/spaa2007.html#AngelBPT07