title: qursed : querying and reporting semistructured data sigmod conference. authors: y papakonstantinou , m petropoulos , v vassalos. venue: nan. year: 2002.0
title: query rewriting using semistructured views y papakonstantinou , v vassalos 1999.0. authors: nan. venue: proc . of the acm sigmod int . conf . on management of data ,. year: nan