title: supporting periodic authorizations and temporal reasoning in database access control 1996. authors: elena ferrari , pierangela samarati , claudio bettini , elisa bertino. venue: vldb. year: nan
title: supporting periodic authorizations and temporal reasoning in database access control 1996. authors: elisa bertino , claudio bettini , elena ferrari , pierangela samarati. venue: very large data bases. year: nan