Sathish Govindarajan Pankaj K. Agarwal Lars Arge CRB-Tree: An Efficient Indexing Scheme for Range-Aggregate Queries. 143-157 2003 conf/icdt/2003 ICDT http://dx.doi.org/10.1007/3-540-36285-1_10 db/conf/icdt/icdt2003.html#GovindarajanAA03