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2. D. Papadias, P. Kalnis, J. Zhang, and Y. Tao. Efficient OLAP Operations in Spatial Data Warehouses. In Proc. of the Int. Symposium in Spatial and Temporal Databases (SSTD'01), Redondo Beach, CA, pages 443--459, 2001. Www.comp.nus.edu.sg/$\sim$kalnis/sstd01.pdf. (www.comp.nus.edu.sg/~kalnis/sstd01.pdf ) (bibtex entry)

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