title: a unified framework for enforcing multiple access control policies s jajodia , p samarati , v subrahmanian , e bertino 1997. authors: nan. venue: sigmod conference. year: nan
title: flexible support for multiple access control policies 2001.0. authors: s jajodia , p samarati , ml sapino , vs subrahmanian. venue: acm transactions on database systems ,. year: nan