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Kok Lim Low. Object representation in computer graphics. Honors year project report, National University of Singapore, Department of Information Systems and Computer Science, 1996.

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J. Rossignac and P. Borrel. Multi-resolution 3D approximations for rendering. In Modeling in Computer Graphics, pages 455-465. Springer-Verlag, June-July 1993.

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Seth J. Teller and Carlo H. Séquin. Visibility preprocessing for interactive walkthroughs. Computer Graphics, 25(4):61-69, 1991. Proceedings of SIGGRAPH'91.