Negation as failure for disjunctive logic programming Phan Minh DungNgo Huu Liem OriginalPaper Pages: 25 - 51
Propositional semantics for disjunctive logic programs Rachel Ben-EliyahuRina Dechter OriginalPaper Pages: 53 - 87
Logic programming and reasoning with incomplete information Michael Gelfond OriginalPaper Pages: 89 - 116