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The five Platonic polyhedra. (Warum es keine eckigen Seifenblasen gibt. Die fünf Platonischen Körper.) (German)
Neue Schulprax. 72, No. 6-7, 33-47 (2003).
Classification: G40
1
New mathematics in the judgement of Urn primary school teachers. (Die Neue Mathematik im Urteil der Urner Primarschullehrer.) (German)
,. 15 p. (1991).
Classification: D32
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