title: a unified framework for enforcing multiple access control policies. authors: v. s. subrahmanian , elisa bertino , pierangela samarati , sushil jajodia. venue: sigmod conference. year: 1997
title: a unified framework for enforcing multiple access control policies. authors: sushil jajodia , pierangela samarati , v. s. subrahmanian , eliza bertino. venue: international conference on management of data. year: 1997