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Tradition and progress an arithmetics teaching. Tradition und Fortschritt im Rechenunterricht. (German)
12th federal meeting for didactics of mathematics. Papers. 12. Bundestagung fuer Didaktik der Mathematik. Vortraege. Hannover, Germany, F.R.: Schroedel. 1978. p. 93-95 Ser. Title: Beitraege zum Mathematikunterricht. Conference: 12. Federal meeting for didactics of mathematics, Muenster, Germany, F.R., 28 Feb - 3 Mar 1978 [ISBN 3-507-35014-9]
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