1. Bussiness Wire. http://www.allbusiness.com/technology/software-services-applications-information/8943546-1.html . Accessed May 2008.
2. Access Control, X.A.C.M.L.: Under Control, Sun Report. http://research.sun.com/spotlight/2005_11_01-XACML.html . Accessed October 2008.
3. NEHTA recommendation. http://www.nehta.gov.au .
4. CEN ENV 13 606 Extended Architecture. http://www.centc251.org/WGI/N-documents/WGI-N04-24-prEN_13606-1_ (E)preENQ.pdf. Accessed June 2007.
5. ISO 22 600. Access Control in Healthcare Information Systems.