http://www.rfc-editor.org/rfc/rfc3010.txt
RFC 3010: NFS version 4 Protocol, S. Shepler, B. Callaghan, D. Robinson, R. Thurlow, C. Beame, M. Eisler, D. Noveck2000-12-01T23:00:00-00:00NFS (Network File System) version 4 is a distributed file system protocol which owes heritage to NFS protocol versions 2 [STANDARDS-TRACK]