The secondary and approximate authorization model and its application to Bell-LaPadula policies. Crampton, J., Leung, W., & Beznosov, K. In Proceedings of the eleventh ACM symposium on Access control models and technologies, pages 111–120, 2006.
bibtex   
@inproceedings{crampton2006secondary,
  title={The secondary and approximate authorization model and its application to Bell-LaPadula policies},
  author={Crampton, Jason and Leung, Wing and Beznosov, Konstantin},
  booktitle={Proceedings of the eleventh ACM symposium on Access control models and technologies},
  pages={111--120},
  year={2006}
}

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