title: incremental maintenance for materialized views over semistructured data. authors: vasilis vassalos , janet l. wiener , michael rys , serge abiteboul , jason mchugh. venue: vldb. year: 1998
title: a fast index for semistructured data. authors: brian cooper , neal sample , michael j. franklin , gisli r. hjaltason , moshe shadmon. venue: very large data bases. year: 2001