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Popularization geometrical concepts: the case of the kaleidoscope. Die Popularisierung geometrischer Sachverhalte: das Kaleidoskop. (English)
Learn. Math. (Nov 1990) v. 10(3) p. 42-50. Paper presented at the ICMI symposium on Popularization of mathematics, University of Leeds, 17-22 Sep 1989. [ISSN 0228-0671]
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