Xiuzhen Zhang Pauline Lienhua Chou Guozhu Dong Efficient Computation of Iceberg Cubes by Bounding Aggregate Functions. 903-918 2007 19 IEEE Trans. Knowl. Data Eng. 7 http://dx.doi.org/10.1109/TKDE.2007.1053 db/journals/tkde/tkde19.html#ZhangCD07