Number | Name | Date | Kind |
---|---|---|---|
4078203 | Borst | Mar 1978 | |
4241408 | Gross | Dec 1980 | |
4837721 | Carmichael et al. | Jun 1989 | |
4991188 | Perkins | Feb 1991 |
Entry |
---|
W. M. Newman and R. F. Sproull, "Principles of Interactive Computer Graphics", 1979, 2nd Edition, McGraw-Hill Book Company, pp. 25-27. |