1996DS/EN ISO/IEC 7942-1:1996 Information technology - Computer graphics and image processing - Graphical Kernel System (GKS) - Part 1: Functional description
1989DS/ISO 7942:1989 Information processing systems. Computer graphics. Graphical Kernel System (GKS) functional description
DS/ISO 7942:1989 Information processing systems. Computer graphics. Graphical Kernel System (GKS) functional description was changed to DS/EN ISO/IEC 7942-1:1996 Information technology - Computer graphics and image processing - Graphical Kernel System (GKS) - Part 1: Functional description.