title: a system for keyword proximity search on xml databases. authors: tianqiu wang , yannis papakonstantinou , nick koudas , vagelis hristidis , andrey balmin , divesh srivastava. venue: vldb. year: 2003
title: a system for watermarking relational databases. authors: rakesh agrawal , peter j. haas , jerry kiernan. venue: international conference on management of data. year: 2003