@inproceedings{DBLP:conf/aaai/GebserLL06,
  author = {Gebser, Martin and Lee, Joohyung and Lierler, Yuliya},
  title = {Elementary Sets of Logic Programs},
  booktitle = {{AAAI}},
  pages = {244--249},
  publisher = {{AAAI} Press},
  year = {2006}
}