Computer Graphics Forum 1993 / CGF 12 - 1 

Duce, D. A.; Paterno, F.
A Formal Specification of a Graphics System in the Framework of the Computer Graphics Reference Model

Yong-Kui, Liu
The Generation of Circular Arcs on Hexagonal Grids

Yong-Kui, Liu
The Generation of Straight Lines on Hexagonal Grids

Chung, K. W.; Chan, H. S. Y.
Symmetrical Patterns from Dynamics

Pickover, Clifford A.; Rudolph, Larry
Electronic Kaleidoscopes for the Mind