1. CADCentre (1981). The command processor user guide, CADCentre, Madingley Road, Cambridge, U.K.
2. CANAL starter guide;Cartwright,1984
3. Smalltalk-80: The language and it's implementation;Goldberg,1983
4. Goodfellow, S.D., N. Munro (1985). An integrated environment for computer aided control systems engineering, 3rd IFAC/IFIP Symposium on computer aided design in control and engineering systems, Denmark, July 1985.
5. Introduction to the Graphical Kernel System (GKS);Hopgood,1983