Nishant Mehta Elke A. Rundensteiner Matthew O. Ward A Hierarchy Navigation Framework: Supporting Scalable Interactive Exploration over Large Databases. 425-434 2005 conf/ideas/2005 IDEAS http://doi.ieeecomputersociety.org/10.1109/IDEAS.2005.5 db/conf/ideas/ideas2005.html#MehtaRW05