@article{KonczakLinkeSchaub2003,
  author    = {Kathrin Konczak and Thomas Linke and Torsten H. Schaub},
  title     = {Graphs and colorings for answer set programming : abridged report},
  url       = {http://www.cs.uni-potsdam.de/wv/pdfformat/kolisch03a.pdf},
  year      = {2003},
}