@inproceedings{
    Janhunen01:lpnmr,
    editor = "Eiter, Thomas and Faber, Wolfgang and Truszczy\'nski, Mirek",
    author = "Janhunen, Tomi",
    publisher = "Springer-Verlag",
    title = "On the Effect of Default Negation on the Expressiveness of Disjunctive Rules",
    url = "http://www.tcs.hut.fi/~ttj/publications/",
    booktitle = "Logic Programming and Nonmonotonic Reasoning, Proceedings of the 6th International Conference",
    address = "Vienna, Austria",
    month = "September",
    note = "LNAI 2173",
    year = "2001",
    pages = "93--106"
}