@techreport{RFC3967,
  title = {{Clarifying when Standards Track Documents may Refer Normatively to Documents at a Lower Level}},
  author = {Bush, R. and Narten, T.},
  type = {RFC},
  number = {3967},
  institution = {IETF},
  month = dec,
  year = 2004,
  url = {http://tools.ietf.org/rfc/rfc3967.txt},
}

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