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The use of interactive video discs for teaching classes and sets. Il videodisco interattivo nell’insegnamento della matematica classi e insiemi. Der Gebrauch von interaktiven Videodisks beim Unterrichten der Mengenlehre. (Italian)
Educ. Mat. (Aug 1989) v. 10(2) p. 143-156. [ISSN 1120-4850]
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