@inproceedings{DBLP:conf/birthday/GebserKKS11,
  author = {Gebser, Martin and Kaminski, Roland and Kaufmann, Benjamin and Schaub, Torsten},
  title = {Challenges in Answer Set Solving},
  booktitle = {Logic Programming, Knowledge Representation, and Nonmonotonic Reasoning},
  series = {Lecture Notes in Computer Science},
  volume = {6565},
  pages = {74--90},
  publisher = {Springer},
  year = {2011}
}