title: integrating the ub-tree into a database system kernel. authors: robert fenk , rudolf bayer , volker markl , martin zirkel , frank ramsak , klaus elhardt. venue: vldb. year: 2000
title: integrating the ub-tree into a database system kernel. authors: frank ramsak , volker markl , robert fenk , martin zirkel , klaus elhardt , rudolf bayer. venue: very large data bases. year: 2000