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Mathematics instruction at lower secondary level in which instructional objectives are reached by use of flexible didactical differentiation. Lernzielerreichender Mathematikunterricht in der Sekundarstufe I (Hauptschule) unter Verwendung der flexiblen didaktischen Differenzierung. (German)
12th federal meeting for didactics of mathematics. Papers. 12. Bundestagung fuer Didaktik der Mathematik. Vortraege. Hannover, Germany, F.R.: Schroedel. 1978. p. 31-33 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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