@inproceedings{
    Janhunen99:lpnmr,
    editor = "Gelfond, Michael and Leone, Nicola and Pfeifer, Gerald",
    author = "Janhunen, Tomi",
    publisher = "Springer-Verlag",
    title = "Classifying Semi-Normal Default Logic on the Basis of its Expressive Power",
    url = "http://www.tcs.hut.fi/~ttj/publications/",
    booktitle = "Proceedings of the 5th International Conference on Logic Programming and Non-Monotonic Reasoning, LPNMR'99",
    address = "El Paso, Texas",
    month = "December",
    note = "LNAI 1730",
    year = "1999",
    pages = "19--33"
}