@techreport{broadfootMartin:grid-sec,
  address = "Oxford University Computing Laboratory, Wolfson Building, Parks Road, Oxford, OX1 3QD, UK",
  author = "Philippa Broadfoot and Andrew Martin",
  institution = "Programming Research Group",
  number = "PRG-RR-03-15",
  title = "Grid Security: Requirements and Technologies A Survey of the State-of-the-art",
  year = "2003",
}