@article{LinkeSchaub1999,
  author    = {Linke, Thomas and Schaub, Torsten H.},
  title     = {Default reasoning via blocking sets},
  year      = {1999},
  language  = {en}
}
@article{LinkeSchaub1999,
  author    = {Linke, Thomas and Schaub, Torsten H.},
  title     = {On bottom-up pre-processing techniques for automated default reasoning},
  isbn      = {3-540-66131-x},
  year      = {1999},
  language  = {en}
}