@inproceedings{SIGMOD-1991-JajodiaS,
	author        = "Sushil Jajodia and Ravi S. Sandhu",
	booktitle     = "{Proceedings of the 21st ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD91/P050.PDF",
	doi           = "10.1145/115790.115796",
	pages         = "50--59",
	title         = "{Towards a Multilevel Secure Relational Data Model}",
	year          = 1991,
}