title: qc-trees : an efficient summary structure for semantic olap laks v. s. lakshmanan , jian pei , yan zhao 2003. authors: nan. venue: sigmod conference. year: nan
title: qc-trees : an efficient summary structure for semantic olap laks v. s. lakshmanan , jian pei , yan zhao 2003. authors: nan. venue: international conference on management of data. year: nan