Ying Zhang Xuemin Lin Yufei Tao Wenjie Zhang Uncertain Location Based Range Aggregates in a Multi-dimensional Space. 1247-1250 2009 ICDE http://dx.doi.org/10.1109/ICDE.2009.212 conf/icde/2009 db/conf/icde/icde2009.html#ZhangLTZ09