Author: Hejný, M.
- : Projekt užitečné matematiky pro 11-15 leté žáky. (Czech) [Project: Useful mathematics for 11-15 year old pupils]. Učitel matematiky, vol. 1 (1993), issue 2, pp. 15-19
- : The method of suplementing a picture by drawing. (Czech). Učitel matematiky, vol. 1 (1993), issue 4, pp. 8-15
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