Computer Graphics Forum 1993 / CGF 12 - 4 

Sun, Jizhou; Zou, L.Q.; Grimsdale, R.L.
The Determination of Form-Factors by Lookup Table

Gargantini, I.; Atkinson, H. H.
Ray Tracing an Octree: Numerical Evaluation of the First Intersection

Tokumasu, Shinji; Harashima, Ichirou; Nakajima, Norihiro
Spanning a C1-Surface over a Given Wireframe

Wainer, Michael; Tan, Ting
A Library for Developing PHIGS Programming Tools in a PEX Environment