[STD16]    Internet Standard 16,
              <https://www.rfc-editor.org/info/std16>.
              At the time of writing, this STD comprises the following:

              Rose, M. and K. McCloghrie, "Structure and identification
              of management information for TCP/IP-based internets",
              STD 16, RFC 1155, DOI 10.17487/RFC1155, May 1990,
              <https://www.rfc-editor.org/info/rfc1155>.

              Rose, M. and K. McCloghrie, "Concise MIB definitions",
              STD 16, RFC 1212, DOI 10.17487/RFC1212, March 1991,
              <https://www.rfc-editor.org/info/rfc1212>.