title: removing permissions in the flexible authorization framework. authors: åsa hagström , duminda wijesekera , francesco parisi-presicce , sushil jajodia. venue: acm trans . database syst .. year: 2003
title: removing permissions in the flexible authorization framework. authors: duminda wijesekera , sushil jajodia , francesco parisi-presicce , &#197; sa hagstr &#246; m. venue: acm transactions on database systems ( tods ). year: 2003