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The development of spatial perception. Entwicklung der Raumwahrnehmung(Le developpement de la perception spatiale). (French)
Processes of geometrisation and visualization. Proceedings. Geometrie und Anschauung(Processus de geometrisation et de visualisation). Proceedings(Compte rendus). Editor(s): Pellerey, M. International Commission for the Study and Improvement of Mathematics Teaching nd . p. 37-49 of 360 p. With 8 figs. Mit 8 Abbildungen. Conference: 33. CIEAEM meeting on processes of geometrisation and visualization, Verbania Pallanza (Italy), 2-9 Aug 1981
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