@article{DBLP:journals/fuin/KonczakSL03,
  author = {Konczak, Kathrin and Schaub, Torsten and Linke, Thomas},
  title = {Graphs and Colorings for Answer Set Programming with Preferences},
  journal = {Fundam. Inform.},
  volume = {57},
  number = {2-4},
  pages = {393--421},
  year = {2003}
}