@conference {16781,
	title = {An algebra and calculus for relational multidatabase systems},
	booktitle = {, First International Workshop on Interoperability in Multidatabase Systems, 1991. IMS {\textquoteright}91. Proceedings},
	year = {1991},
	month = {1991/04//},
	pages = {118 - 124},
	publisher = {IEEE},
	organization = {IEEE},
	abstract = {With the existence of many autonomous databases widely accessible through computer networks, users will require the capability to jointly manipulate data in different databases. A multidatabase system provides such a capability through a multidatabase manipulation language. The authors propose a theoretical foundation for such languages by presenting a multirelational algebra and calculus based on the relational algebra and calculus. The proposal is illustrated by various queries on an example multidatabase},
	keywords = {Algebra, autonomous databases, Calculus, Computer networks, Computer science, Data models, Data structures, Database systems, database theory, distributed databases, Military computing, multidatabase manipulation language, multidatabase system, multirelational algebra, query languages, relational algebra, Relational databases, Spatial databases, theoretical foundation},
	isbn = {0-8186-2205-9},
	doi = {10.1109/IMS.1991.153694},
	author = {Grant,J. and Litwin,W. and Roussopoulos, Nick and Sellis,T.}
}
