Jongwan Kim SeokJin Im Sang-Won Kang Chong-Sun Hwang Spatial Index Compression for Location-Based Services Based on a MBR Semi-approximation Scheme. 26-35 2006 conf/waim/2006 WAIM http://dx.doi.org/10.1007/11775300_3 db/conf/waim/waim2006.html#KimIKH06