1. G. Allan, Solids Modelling Systems, Tutorial Notes; NCGA’82, Anaheim, CA (June 1982)
2. P. Bono, J. EncarnaCão, F.R.A. Hopgood, and P.J.W. ten Hagen, GKS–The First Graphics Standard, IEEE Computer Graphics and Applications, Vol. 2, No. 5 (July 1982), pp. 9–24
3. I.C. Braid, R.C. Hillyard, and I.A. Stroud, Stepwise Construction of Polyhedra in Geometric Modelling, in Mathematical Methods in Computer Graphics and Design, K.W.Brodlie (ed.), Academic Press, London (1980), pp. 123–141
4. C.M. Brown, PADL-2: A Technical Summary, IEEE Computer Graphics and Applications, Vol. 2, No. 2 (March 1982), pp. 69–85
5. J. Encarnapão (Ed.), Computer Aided Design: Modelling, Systems Engineering, CAD-Systems, Lecture Notes in Computer Science, Vol. 89 (1980), Springer Verlag, Heidelberg