Warning - the bibtex entry below may be invalid: 
Missing 'institution' field 
@techreport{elmanetal2002,
  author = "H. Elman, D. Kay, D. Loghin, D. J. Silvester and A. J. Wathen",
  journal = "Oxford Numerical Analysis Group",
  number = "4",
  title = "A preconditioner for the 3D Oseen equations",
  volume = "NA-02",
  year = "2002",
}