Data elements and interchange formats; information interchange; representation of dates and times (ISO 8601:1988 and its technical corrigendum 1:1991); german version EN 28601:1992— 14 стр.
Information technology - Open Systems Interconnection - Part 1: Basic Reference Model: The Basic Model (ISO/IEC 7498-1:1994); English version EN ISO/IEC 7498-1:1995