Data Warehousing and Knowledge Discovery 6th International Conference, DaWaK 2004, Zaragoza, Spain, September 1-3, 2004, Proceedings - Kambayashi, Yahiko; Kambayashi, Yahiko; Mohania, Mukesh; Mohania, Mukesh; Wöß, Wolfram; Wöß, Wolfram (Springer Berlin Heidelberg : Imprint: Springer, 2004)