@inproceedings{JSVaidyaSacmat07rm,
  author = "Jaideep Vaidya and Vijay Atluri and Qi Guo",
  title = "The Role Mining Problem: Finding a Minimal Descriptive Set
of Roles", 
  booktitle = "The Twelth ACM Symposium on Access Control Models and
Technologies",
  address = "Sophia Antipolis, France",
  month = jun # "20-22",
  pages = "175--184",
  year = 2007
}