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On the methodology of descriptive geometry. Pt. 7. Mappings in descriptive geometry lessons. Pt. 1. Zur Methodik der darstellenden Geometrie. T. 7. Abbildungen im Unterricht der darstellenden Geometrie. T. 1. (German)
IBDG (Informationsbl. Darst. Geom.). (1988) v. 7(1) p. 7-16.
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