@article{DBLP:journals/ai/EiterL00,
  title = "Default Reasoning from Conditional Knowledge Bases: Complexity and Tractable Cases",
  author = "Thomas Eiter and Thomas Lukasiewicz",
  year = "2000",
  journal = "Artificial Intelligence",
  month = "December",
  number = "2",
  pages = "169--241",
  url = "http://dx.doi.org/10.1016/S0004-3702(00)00073-4",
  volume = "124",
}