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: re-tree : an efficient index structure for regular expressions chee-yong chan , minos garofalakis , rajeev rastogi 2003. authors: nan. venue: the vldb journal -- the international journal on very large data bases. year: nan