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*Ivan E. Sutherland, Robert F, Sproull, and Robert A, Schumacker, “A Characterization of Ten Hidden-Surface Algorithms”, Computing Surveys, Vol 6, No 1, March 1974
* Newell, M E, Newell R. G, and sancha, T.L, “ A New Approach to the Shaded Picture Problem”, Proc ACM National Conf. 1972
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