@article{DBLP:journals/logcom/GebserGMS09,
  author = {Gebser, Martin and Gharib, Mona and Mercer, Robert E. and Schaub, Torsten},
  title = {Monotonic Answer Set Programming},
  journal = {J. Log. Comput.},
  volume = {19},
  number = {4},
  pages = {539--564},
  year = {2009}
}