@inproceedings{Power_et_al_2005e,
  title = "On {XACML}, role-based access control, and health grids",
  author = "D. J. Power and M. A. Slaymaker and E. A. Politou and A. C. Simpson",
  year = "2005",
  booktitle = "Proceedings of the 2005 UK e-Science All Hands Meeting",
}