@MastersThesis{Applying_Policy_Based_Access_Control_and_XML_Digital_Signatures_for_Security_in_Pervasive_Computing_Environments,
  author = "Mohinder  Chopra",
  title = "{Applying Policy Based Access Control and XML Digital Signatures for Security in Pervasive Computing Environments}",
  month = "May",
  year = "2005",
}