title: description logics for semantic query optimization in object-oriented database systems claudio sartori , sonia bergamaschi , domenico beneventano. authors: nan. venue: acm trans . database syst .. year: 2003.0
title: join index hierarchies for supporting efficient navigations in object-oriented databases zhaohui xie , jiawei han 1994. authors: nan. venue: very large data bases. year: nan