title: qc-trees : an efficient summary structure for semantic olap sigmod conference 2003. authors: l lakshmanan , j pei , y zhao. venue: nan. year: nan
title: qc-trees : an effective summary structure for semantic olap lvs lakshmanan , j pei , y zhao proceedings of the 2003 acm sigmod international conference & hellip ; ,. authors: nan. venue: nan. year: nan