Warning - the bibtex entry below may be invalid: 
Missing 'institution' field 
@techreport{IPP,
  author = "Stephen Drape",
  month = "March",
  title = "Intellectual Property Protection using Obfuscation",
  url = "http://web.comlab.ox.ac.uk/people/stephen.drape/papers/siemens.pdf",
  year = "2009",
}