Oliver, D., S. Anderson, B. Zigon, J. 
McCord, S. Gumas, 1993. Tricks of 
the Graphics — Gurus. SAMS 
Publishing, Indiana, U.S.A. 894 pages. 
Salmon, -R, M. Slater, 1987. 
Computer Graphics: Systems and 
Concepts. Addison-Wesley Publishing 
Company, New York, U. S. A. 702 
pages. 
Watt, A, 1993 3D Computer 
Graphics. Addison-Wesley Publishing 
Company, New York, U. S. A. 500 
pages. 
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