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REFERENCES
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.RP
.ne 3v
[Abbott 52]  Edwin A. Abbott,
\fIFlatland\fR, Dover Publications, Inc., New York NY, 1952.

.RP
.ne 4v
[Banchoff 90]  Thomas F. Banchoff,
\fIBeyond the Third Dimension\fR, Scientific American Library,
New York NY, 1990.

.RP
.ne 4v
[Barnhill 84]  R. E. Barnhill and F. F. Little,
``Three- and Four-Dimensional Surfaces,''
\fIThe Rocky Mountain Journal of Mathematics\fR 14(1),
Winter 1984, pp 77-102.

.RP
.ne 4v
[Brisson 78]  edited by David W. Brisson,
``Visual Comprehension of \fIn\fR-Dimensions,''
\fIHypergraphics:  Visualizing Complex Relationships in Art, Science &
Technology\fR, Westview Press, Boulder CO, 1978, pp 109-146.

.RP
.ne 4v
[Carey 87]  Scott A. Carey, Robert P. Burton, and Douglas M. Campbell,
``Shades of a Higher Dimension,''
\fIComputer Graphics World\fR, October 1987, pp 93-94.

.RP
.ne 4v
[Chen 85]  L. Chen, G. Herman, R. Reynolds, J. Udupa,
``Surface Shading in the Cuberille Environment,''
\fIIEEE Computer Graphics and Applications\fR 5(12), December 1985, pp 33-43.

.RP
.ne 4v
[Chen 90]  Chao-Chi Chen,
``Interpolation of Orientation Matrices Using Sphere Splines in Computer
Animation,''
Master's Thesis, Computer Science Department, Arizona State University,
December 1990.

.RP
.ne 4v
[Dewdney 84]  A. K. Dewdney,
\fIThe Planiverse:  Computer Contact with a Two-Dimensional World\fR,
Poseidon Press, New York NY, 1984.

.RP
.ne 4v
[Dewdney 86]  A. K. Dewdney,
``Computer Recreations,'' \fIScientific American\fR, April 1986, pp 14-23.

.RP
.ne 4v
[Drebin 88]  Robert Drebin, Loren Carpenter, Pat Hanrahan,
``Volume Rendering,''
\fIComputer Graphics\fR 22(4), August 1988, pp 65-74.

.RP
.ne 4v
[Farin 88]  Gerald Farin,
\fICurves and Surfaces for Computer Aided Geometric Design\fR,
Academic Press, Inc., San Diego CA, 1988, pp 19,238.

.RP
.ne 4v
[Foley 87]  Thomas A. Foley, Gregory M. Nielson,
``Practical Techniques for Producing 3D Graphical Images,''
\fIVMEbus Systems\fR,  November-December 1987, pp 65-73.

.RP
.ne 4v
[Frieder 85]  G. Frieder, D. Gordon, R. Reynolds,
``Back-to-Front Display of Voxel-Based Objects,''
\fIIEEE Computer Graphics and Applications\fR 5(1), January 1985, pp 52-60.

.RP
.ne 4v
[Glassner 90]  Andrew Glassner,
\fIGraphics Gems\fR, Academic Press, Inc., San Diego CA, 1990, pp 390-393.

.RP
.ne 4v
[Hall 89]  Roy Hall,
\fIIllumination and Color in Complex Generated Imagery\fR,
Springer-Verlag, New York NY, 1989, p 153.

.RP
.ne 4v
[Hill 90]  Francis S. Hill, Jr.,
\fIComputer Graphics\fR, Macmillan Publishing Co., New York NY, 1990.

.RP
.ne 4v
[Kajiya 84]  James Kajiya, Brian Von Herzen,
``Ray Tracing Volume Densities,''
\fIComputer Graphics\fR 18(3), July 1984, pp 165-174.

.RP
.ne 4v
[Lorensen 87]  William Lorensen, Harvey Cline,
``Marching Cubes:  A High Resolution 3D Surface Construction Algorithm,''
\fIComputer Graphics\fR 21(4), July 1987, pp 163-169.

.RP
.ne 4v
[Noll 67]  Michael A. Noll,
``A Computer Technique for Displaying n-Dimensional Hyperobjects,''
\fICommunications of the ACM\fR 10(8), August 1967, pp 469-473.

.RP
.ne 4v
[Sabella 88]  Paolo Sabella,
``A Rendering Algorithm for Visualizing 3D Scalar Fields,''
\fIComputer Graphics\fR 22(4), August 1988, pp 51-55.

.RP
.ne 4v
[Steiner 87]  K. Victor Steiner and Robert P. Burton,
``Hidden Volumes:  The 4th Dimension,''
\fIComputer Graphics World\fR, February 1987, pp 71-74.

.RP
.ne 4v
[Whitted 80]  Turner Whitted,
``An Improved Illumination Model for Shaded Display,''
\fICommunications of the ACM\fR 23(6), June 1980, pp 343-349.
