@article{Weigand2006,
  author    = {Christoph Weigand},
  title     = {A Solution to the Scheduling Problem Taking into Account Quality},
  journal   = {Operations research '91 : extended abstracts of the 16th Symposium on Operations Research held at the University of Trier at September 9 - 11, 1991 / [GM{\"O}OR]. Peter Gritzmann ... (eds.)},
  pages     = {373 -- 375},
  year      = {2006},
}