1. Information Processing Systems—Computer Graphics—Graphical Kernel System (GKS), Functional Description. ISO Standard 7942.
2. Information Processing Systems—Computer Graphics—Graphical Kernel System for Three Dimensions (GKS-3D) Functional Description. ISO/TC97/SC21 N853 DIS 8805.
3. Information Processing Systems—Computer Graphics—Programmer's Hierarchical Interactive Graphics System (PHIGS). ISO/TC97/SC21 N 819 DP 9592.
4. J. E. Steinhart, Proposal for GKS output level 3. ANSI X3H31/84-09R2.
5. PHI-GKS workshop report;Daun,1986