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| 4905163 | Garber et al. | Feb 1990 | |
| 5572643 | Judson | Nov 1996 | |
| 5592602 | Edmunds et al. | Jan 1997 |
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| "HyperCard Version 2.3"Apple Computer, Inc. Webpage, last updated May 2, 1996. |
| "An Introduction to m Tropolis" m Tropolis, Inc. Webpage. |