Pavlos Efraimidis Paul G. Spirakis Randomized Approximation Schemes for Scheduling Unrelated Parallel Machines Electronic Colloquium on Computational Complexity (ECCC) 2000 7 7 db/journals/eccc/eccc7.html#ECCC-TR00-007 http://eccc.hpi-web.de/eccc-reports/2000/TR00-007/index.html