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On methods of descriptive geometry. Pt. 9. Mappings in the teaching of descriptive geometry. Pt. 3. Zur Methodik der Darstellenden Geometrie. T. 9. Abbildungen im Unterricht der Darstellenden Geometrie. T. 3. (German)
IBDG (Informationsbl. Darst. Geom.). (1989) v. 8(1) p. 5-14.
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