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A Formal Approach to Null Values in Database Relations.

. Advances in Data Base Theory, page 299-341. New York, Plemum Press, (1979)

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Sicherheit in Informationssystemen - Gewährleistung und Begrenzung des Informationsflusses.. VIS, volume 271 of Informatik-Fachberichte, page 1-21. Springer, (1991)For Unknown Secrecies Refusal is Better than Lying.. DBSec, volume 171 of IFIP Conference Proceedings, page 127-141. Kluwer, (1999)For unknown secrecies refusal is better than lying.. Data Knowl. Eng., 33 (1): 1-23 (2000)Über Projektionsmengen von Komplexitätsmaßen.. Elektronische Informationsverarbeitung und Kybernetik, 13 (7/8): 359-368 (1977)Confidentiality enforcement by hybrid control of information flows., , and . CoRR, (2017)A Foundation of Codd's Relational Maybe-Operations.. ACM Trans. Database Syst., 8 (4): 608-636 (1983)Inference-Proof View Update Transactions with Minimal Refusals., and . DPM/SETOP, volume 7122 of Lecture Notes in Computer Science, page 104-121. Springer, (2011)Optimistic Anonymous Participation in Inter-organizational Workflow Instances., and . ICISS, volume 4332 of Lecture Notes in Computer Science, page 86-100. Springer, (2006)Sicherheit: Gewährleistung und Begrenzung des Informationsflusses.. Entwicklungstendenzen bei Datenbanksystemen, Oldenbourg Verlag, Müchen, Wien, (1991)Controlled Query Evaluation for Known Policies by Combining Lying and Refusal., and . FoIKS, volume 2284 of Lecture Notes in Computer Science, page 49-66. Springer, (2002)