@book{ ada99,
  author = {Carlisle Adams and Steve Lloyd},
  title = {Understanding Public-Key Infrastructure: Concepts, Standards, and Deployment Considerations},
  publisher = {Macmillan Publishing},
  year = {1999},
  month = {November},
  address = {Indianapolis, Indiana},
  isbn = {157870166X},
  index = {PKI, PKIX, X.509}
}