Issue No.03 - July-September (1981 vol.1)
L.J. Doctor , Raster Technologies, Inc.
A family of algorithms and extensions provides a computationally efficient means of displaying shaded, semitransparent 3-D objects.
L.J. Doctor, J.G. Torborg, "Display Techniques for Octree-Encoded Objects", IEEE Computer Graphics and Applications, vol.1, no. 3, pp. 29-38, July-September 1981, doi:10.1109/MCG.1981.1673936