title: storing and querying ordered xml using a relational database system. authors: kevin s. beyer , jayavel shanmugasundaram , chun zhang , igor tatarinov , stratis viglas , eugene j. shekita. venue: sigmod conference. year: 2002
title: olap , relational , and multidimensional database systems. authors: george colliat. venue: acm sigmod record. year: 1996