title: providing dynamic security control in a federated database r. f. churchhouse , w. a. gray , n. b. idris vldb. authors: nan. venue: nan. year: 1994.0
title: providing dynamic security control in a federated database n. b. idris , w. a. gray , r. f. churchhouse very large data bases. authors: nan. venue: nan. year: 1994.0