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A logo-based microworld for ratio and proportion. Eine auf Logo basierende Mikrowelt fuer das Thema Verhaeltnis und Proportion. (English)
Thirteenth international conference of the International Group on Psychology of Mathematics Education. Vol. 2. Proceedings. 13. internationale Tagung der Gruppe fuer Psychologie und Mathematikunterricht. Bd. 2. Proceedings. International Group for the Psychology of Mathematics Education; Paris-5 Univ., 75 (France). Lab. de Psychologie du Developpement et de l’Education de l’Enfant 1989. p. 115-122 of 311 p. Available from Paris-5 Univ., 75 (France). Lab. de Psychologie du Developpement et de l’Education de l’Enfant. Conference: 13. Annual Conference of the International Group for the Psychology of Mathematics Education (PME), Paris (France), 9-13 Jul 1989
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