[BCP173]   Best Current Practice 173,
              <https://www.rfc-editor.org/info/bcp173>.
              At the time of writing, this BCP comprises the following:

              Kent, S., Kong, D., Seo, K., and R. Watro, "Certificate
              Policy (CP) for the Resource Public Key Infrastructure
              (RPKI)", BCP 173, RFC 6484, DOI 10.17487/RFC6484, February
              2012, <https://www.rfc-editor.org/info/rfc6484>.

              Kent, S., Kong, D., and K. Seo, "Template for a
              Certification Practice Statement (CPS) for the Resource
              PKI (RPKI)", BCP 173, RFC 7382, DOI 10.17487/RFC7382,
              April 2015, <https://www.rfc-editor.org/info/rfc7382>.