[BCP41]    Best Current Practice 41,
              <https://www.rfc-editor.org/info/bcp41>.
              At the time of writing, this BCP comprises the following:

              Floyd, S., "Congestion Control Principles", BCP 41,
              RFC 2914, DOI 10.17487/RFC2914, September 2000,
              <https://www.rfc-editor.org/info/rfc2914>.

              Briscoe, B. and J. Manner, "Byte and Packet Congestion
              Notification", BCP 41, RFC 7141, DOI 10.17487/RFC7141,
              February 2014, <https://www.rfc-editor.org/info/rfc7141>.