Cyrus Shahabi Mehrdad Jahangiri Dimitris Sacharidis Hybrid Query and Data Ordering for Fast and Progressive Range-Aggregate Query Answering. 49-69 2005 1 IJDWM 2 http://www.igi-pub.com/articles/details.asp?ID=4823 db/journals/jdwm/ijdwm1.html#ShahabiJS05