@article{FichteSzeider2015,
  author    = {Johannes Klaus Fichte and Stefan Szeider},
  title     = {Backdoors to tractable answer set programming},
  journal   = {Artificial intelligence},
  volume    = {220},
  pages     = {64 -- 103},
  doi       = {10.1016/j.artint.2014.12.001},
  year      = {2015},
}