[STD49]    Internet Standard 49,
              <https://www.rfc-editor.org/info/std49>.
              At the time of writing, this STD comprises the following:

              McLaughlin, L., "Standard for the transmission of 802.2
              packets over IPX networks", STD 49, RFC 1132,
              DOI 10.17487/RFC1132, November 1989,
              <https://www.rfc-editor.org/info/rfc1132>.