@article{JSVaidyaJCS09,
  title = "Edge-EMP: Minimizing administrative assignments for
role-based access control",
  author = "Jaideep Vaidya and Vijayalakshmi Atluri and Qi Guo and
haibing Lu",
  journal = "Journal of Computer Security",
  volume = 17,
  number = 2,
  doi = "10.3233/JCS-2009-0341",
  year = "2009",
  pages = "211--235"
}