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An Extended Authorization Model for Relation Databases. Bertino E,Samarati P,Jajodia S. IEEE Transaction on Knowledge and Data Engineering . 1997
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A Logical Language for Exp- ressing Authorization. Jajodia S,Samarati P,Subrahmanian VS. . 1997
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Role_based Access Control Model. Sandhu RS,Coyne EJ,Feinstein HL et al. IEEE Computer . 1996