[BCP9]     Best Current Practice 9,
              <https://www.rfc-editor.org/info/bcp9>.
              At the time of writing, this BCP comprises the following:

              Bradner, S., "The Internet Standards Process -- Revision
              3", BCP 9, RFC 2026, DOI 10.17487/RFC2026, October 1996,
              <https://www.rfc-editor.org/info/rfc2026>.

              Dusseault, L. and R. Sparks, "Guidance on Interoperation
              and Implementation Reports for Advancement to Draft
              Standard", BCP 9, RFC 5657, DOI 10.17487/RFC5657,
              September 2009, <https://www.rfc-editor.org/info/rfc5657>.

              Housley, R., Crocker, D., and E. Burger, "Reducing the
              Standards Track to Two Maturity Levels", BCP 9, RFC 6410,
              DOI 10.17487/RFC6410, October 2011,
              <https://www.rfc-editor.org/info/rfc6410>.

              Resnick, P., "Retirement of the "Internet Official
              Protocol Standards" Summary Document", BCP 9, RFC 7100,
              DOI 10.17487/RFC7100, December 2013,
              <https://www.rfc-editor.org/info/rfc7100>.

              Kolkman, O., Bradner, S., and S. Turner, "Characterization
              of Proposed Standards", BCP 9, RFC 7127,
              DOI 10.17487/RFC7127, January 2014,
              <https://www.rfc-editor.org/info/rfc7127>.

              Dawkins, S., "Increasing the Number of Area Directors in
              an IETF Area", BCP 9, RFC 7475, DOI 10.17487/RFC7475,
              March 2015, <https://www.rfc-editor.org/info/rfc7475>.

              Halpern, J., Ed. and E. Rescorla, Ed., "IETF Stream
              Documents Require IETF Rough Consensus", BCP 9, RFC 8789,
              DOI 10.17487/RFC8789, June 2020,
              <https://www.rfc-editor.org/info/rfc8789>.

              Rosen, B., "Responsibility Change for the RFC Series",
              BCP 9, RFC 9282, DOI 10.17487/RFC9282, June 2022,
              <https://www.rfc-editor.org/info/rfc9282>.