@article{journals/ai/GottlobSS02,
  title = "Fixed-parameter complexity in AI and nonmonotonic reasoning",
  author = "Georg Gottlob and Francesco Scarcello and Martha Sideri",
  year = "2002",
  journal = "Artif. Intell.",
  number = "1-2",
  pages = "55-86",
  volume = "138",
  doi = "10.1016/S0004-3702(02)00182-0",
}