title: apex : an adaptive path index for xml data chin-wan chung , kyuseok shim , jun-ki min. authors: nan. venue: sigmod conference. year: 2002.0
title: d ( k ) - index : an adaptive structural summary for graph-structured data qun chen , andrew lim , kian win ong. authors: nan. venue: international conference on management of data. year: 2003.0