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Whitted, Turner (June 1980), "An Improved Illumination Model for Shaded Display", Communications of the ACM, 23 (6): 343–349, doi:10.1145/358876.358882, S2CID9524504
Requicha, A. A. G. (December 1980). "Representation for rigid solids: Theory, methods, and systems". ACM Computing Surveys. 12 (4): 437–464. doi:10.1145/356827.356833. S2CID207568300.
Whitted, Turner (June 1980), "An Improved Illumination Model for Shaded Display", Communications of the ACM, 23 (6): 343–349, doi:10.1145/358876.358882, S2CID9524504