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ISSN:0273-1223|35|11|351-357

Elsevier‎(1997)‎

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By SCHWEIZER KARIN   PAECHTER MANUELA   WEIDENMANN BERND   in Journal of Educational Media

ISSN:1469-9443|28|2-3|211-224

Routledge Ltd‎(2003)‎

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