@article{KonczakLinkeSchaub2004,
  author    = {Konczak, Kathrin and Linke, Thomas and Schaub, Torsten H.},
  title     = {Graphs and cologings for answer set programming : adridged report},
  isbn      = {3-540- 20721-x},
  year      = {2004},
  language  = {en}
}