[BCP188]   Best Current Practice 188,
              <https://www.rfc-editor.org/info/bcp188>.
              At the time of writing, this BCP comprises the following:

              Farrell, S. and H. Tschofenig, "Pervasive Monitoring Is an
              Attack", BCP 188, RFC 7258, DOI 10.17487/RFC7258, May
              2014, <https://www.rfc-editor.org/info/rfc7258>.