@inproceedings{
    mrpods89,
    author = {Mannila, Heikki and R{\"a}ih{\"a}, K.-J.},
    booktitle = "Proceedings of the Eigth ACM SIGACT-SIGMOD-SIGART Symposium on Database and Knowledgebase Systems",
    year = "1989",
    pages = "128-133",
    title = "Practical algorithms for finding prime attributes and testing normal forms"
}