| Windbase Software Announces CDSL Version 1.2., C Users Journal v10 n11, p. 136, Nov. 1992.* |
| Lloyd Allison, Circular Programs and Self-referential Structures, Software—Practice and Experience, Feb. 1989.* |
| Rex Jaechke, “Data Structures, part 8; circular lists”, C Users Journal v9 n12, p. 18 (9), Dec. 1991.* |
| Extended Pie Menry, IBM Technical Disclosure Bulletin, v37 2b, pp. 397-398, Feb. 1994.* |
| Gordon Paul Kurtenback, “The Design and Evaluation of Marking Menus”, 1993.* |
| P.J. Lyons, “The Oval Menu—Evolution and Evaluation of a Widget,” IEEE, p. 252-259, 1996. |