[BCP193]   Best Current Practice 193,
              <https://www.rfc-editor.org/info/bcp193>.
              At the time of writing, this BCP comprises the following:

              Morand, L., Ed., Fajardo, V., and H. Tschofenig, "Diameter
              Applications Design Guidelines", BCP 193, RFC 7423,
              DOI 10.17487/RFC7423, November 2014,
              <https://www.rfc-editor.org/info/rfc7423>.