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<subfield code="a">SAAM</subfield>
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<subfield code="a">JAMES</subfield>
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<subfield code="a">access control</subfield>
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<subfield code="a">Bell-LaPadulla</subfield>
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<subfield code="a">BLP</subfield>
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<subfield code="a">access control models and languages</subfield>
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