Arthur Appel. Some techniques for shading machine renderings of solids. In American Federation of Information Processing Societies: AFIPS Conference Proceedings: 1968 Spring Joint Computer Conference, Atlantic City, NJ, USA, 30 April - 2 May 1968. Volume 32 of AFIPS Conference Proceedings, pages 37-45, Thomson Book Company, Washington D.C., 1968. [doi]
Abstract is missing.