db/conf/coopis/KedadB99.html Zoubida Kedad Mokrane Bouzeghoub Discovering View Expressions from a Multi-Source Information System. 57-68 DiSC2_1/out/papers/coopis/03840057.pdf 1999 conf/coopis/1999 CoopIS http://computer.org/proceedings/coopis/0384/03840057abs.htm db/conf/coopis/coopis99.html#KedadB99