Michael Ortega-Binderberger Kaushik Chakrabarti Sharad Mehrotra An Approach to Integrating Query Refinement in SQL. 15-33 2002 conf/edbt/2002 EDBT http://dx.doi.org/10.1007/3-540-45876-X_4 db/conf/edbt/edbt2002.html#Ortega-BinderbergerCM02