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JUCS - Journal of Universal Computer Science 10(1): 4-13
doi:
10.3217/jucs-010-01-0004
Published:
28 Jan 2004
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Authors
Heidrun Allert 
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Learning Lab Lower Saxony, University of Hanover, Hanover, Germany
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Learning Lab Lower Saxony, University of Hanover, Hanover, Germany
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Learning Lab Lower Saxony, University of Hanover, Hanover, Germany
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Conflict of interest
The authors have declared that no competing interests exist.
This article is freely available under the J.UCS Open Content License.