title: semistructured und structured data in the web : going back and forth sigmod record. authors: paolo merialdo , giansalvatore mecca , paolo atzeni. venue: nan. year: 1997.0
title: semantic integration of semistructured and structured data sources. authors: s. bergamaschi , s. castano , m. vincini. venue: acm sigmod record. year: 1999.0