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Geometry. Raumlehre. (German)
Manual on remedial didactics. Handbuch der Lernbehindertendidaktik. Editor(s): Baier, H.; Bleidick, U. Stuttgart: Kohlhammer. 1983. p. 329-339 of 488 p. Ser. Title: Kohlhammer-Handbuecher Schulpraxis. [ISBN 3-17-008144-6]
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