@inproceedings{
    egmpods,
    author = "Eiter, T. and Gottlob, G. and Mannila, Heikki",
    booktitle = "Proceedings of the 1994 ACM SIGACT-SIGMOD-SIGACT Symposium on Principles of Database Theory (PODS'94)",
    year = "1994",
    pages = "267-278",
    title = "Expressive power and complexity of disjunctive datalog"
}