Nouha Bouteldja Valérie Gouet-Brunet Michel Scholl HiPeR : Hierarchical progressive exact retrieval in multi dimensional spaces. 320-329 2008 ICDE Workshops http://dx.doi.org/10.1109/ICDEW.2008.4498341 conf/icde/2008w db/conf/icde/icdew2008.html#BouteldjaGS08