@InProceedings{koschli03a,
  author = "K. Konczak and T. Schaub and T. Linke",
  title = "Graphs and colorings for answer set programming with preferences: Preliminary Report",
  booktitle = "Proceedings of the Second International Workshop on Answer Set Programming (ASP'03)", 
  year =	 2003,
  publisher =    "CEUR Workshop Proceedings",
  editor =	 "M. De Vos and A. Provetti",
  pages =	 "43--56",
  volume =       78,
  note =	 "\texttt{http://sunsite.informatik.rwth-aachen.de/Publications/CEUR-WS/Vol-78/}"
}