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2. Writing Applications with graPHIGS, IBM graPHIGS Library Manual SC33-8103, IBM Corporation, Neighborhood Road, Kingston, NY 12401.
3. Programmer’s Reference for graPHIGS, IBM graPHIGS Library Manual SC33-8104, IBM Corporation, Neighborhood Road, Kingston, NY 12401.
4. S.S. Abi-Ezzi and A.J. Bunshaft, IEEE Computer Graphics and Applications, February 1986, page 12.
5. IBM 5080 Graphics System Operations Guide, IBM Corporation, White Plains, NY, 1986.