title: a system for watermarking relational databases peter j. haas , rakesh agrawal , jerry kiernan sigmod conference. authors: nan. venue: nan. year: 2003.0
title: vxmlr : a visual xml-relational database system 2001. authors: aoying zhou , hongjun lu , shihui zheng , yuqi liang , long zhang , wenyun ji , zengping tian. venue: very large data bases. year: nan