@inproceedings{
    Niemela92:ecai,
    author = {Niemel{\"a}, Ilkka},
    publisher = "John Wiley",
    title = "A unifying framework for nonmonotonic reasoning",
    booktitle = "Proceedings of the 10th European Conference on Artificial Intelligence",
    address = "Vienna, Austria",
    month = "August",
    year = "1992",
    organization = "",
    pages = "334--338"
}