Warning - the bibtex entry below may be invalid: 
Missing 'institution' field 
@techreport{Hidden Markov Model,
  abstract = "Nuffield Foundation Science Research Bursary",
  author = "Long Hoang Nguyen",
  booktitle = "Nuffield Foundation Science Research Bursary",
  journal = "Technical report for the Nuffield Foundation Science Research Bursary",
  title = "Side Channel Attack By Using Hidden Markov Model",
  url = "http://www.comlab.ox.ac.uk/people/long.nguyen/NuffieldReport.pdf",
  year = "2004, Technical report for the Nuffield Foundation Science Research Bursary",
}