@Article{Wieczorek2009,
  Title                    = {Towards a General Model of the Multi-Criteria Workflow Scheduling on the Grid},
  Author                   = {Marek Wieczorek and Andreas Hoheisel and Radu Prodan},
  Journal                  = {Future Generations Computer Systems},
  Year                     = {2009},
  Number                   = {3},
  Pages                    = {237-256},
  Volume                   = {25}
}


@Article{ullman1975np,
  Title                    = {NP-complete scheduling problems},
  Author                   = {Ullman, J.D.},
  Journal                  = {Journal of Computer and System sciences},
  Year                     = {1975},
  Number                   = {3},
  Pages                    = {384--393},
  Volume                   = {10},
  Publisher                = {Elsevier}
}


@Article{heft02,
  Title                    = {Performance-effective and low-complexity task scheduling for heterogeneous computing},
  Author                   = {Topcuoglu, H. and Hariri, S. and Min-You Wu},
  Journal                  = {IEEE Transactions on Parallel and Distributed Systems},
  Year                     = 2002,
  Month                    = 3,
  Number                   = 3,
  Pages                    = {260--274},
  Volume                   = 13
}