title: vxmlr : a visual xml-relational database system. authors: aoying zhou , wenyun ji , shihui zheng , hongjun lu , yuqi liang , zengping tian , long zhang. venue: vldb. year: 2001
title: a system for watermarking relational databases. authors: rakesh agrawal , peter j. haas , jerry kiernan. venue: international conference on management of data. year: 2003