@techreport{RFC4721,
  title = {{Mobile IPv4 Challenge/Response Extensions (Revised)}},
  author = {Perkins, C. and Calhoun, P. and Bharatia, J.},
  type = {RFC},
  number = {4721},
  institution = {IETF},
  month = jan,
  year = 2007,
  url = {http://tools.ietf.org/rfc/rfc4721.txt},
}

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