Documents by R. Clements
1973, RFC0438: FTP server-server interaction
1973, RFC0582: Comments on RFC 580: Machine readable protocols
1975, RFC0683: FTPSRV - Tenex extension for paged files
1975, RFC0689: Tenex NCP finite state machine for connections
1983, RFC0844: Who talks ICMP, too? - Survey of 18 February 1983