@article{FichteSzeider15,
 author = {Johannes Klaus Fichte and
Stefan Szeider},
 doi = {10.1016/j.artint.2014.12.001},
 journal = {Artificial Intelligence},
 month = {3},
 pages = {64--103},
 title = {Backdoors to Tractable Answer Set Programming},
 volume = {220},
 year = {2015}
}