title: a system for watermarking relational databases peter j. haas , rakesh agrawal , jerry kiernan sigmod conference. authors: nan. venue: nan. year: 2003.0
title: schemasql - a language for interoperability in relational multi-database systems very large data bases. authors: laks v. s. lakshmanan , fereidoon sadri , iyer n. subramanian. venue: nan. year: 1996.0