title: outerjoin simplification and reordering for query optimization. authors: césar a. galindo-legaria , arnon rosenthal. venue: acm trans . database syst .. year: 1997
title: materialized view selection and maintenance using multi-query optimization. authors: hoshi mistry , prasan roy , s. sudarshan , krithi ramamritham. venue: international conference on management of data. year: 2001