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JUCS - Journal of Universal Computer Science 24(2): 85-107
doi:
10.3217/jucs-024-02-0085
Received:
25 Sep 2017 | Approved:
03 Nov 2017 | Published:
28 Feb 2018
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Authors
Jan Schneider 
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DIPF - Leibniz Institute for Research and Information in Education, Frankfurt am Main, Germany
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Open University of the Netherlands, Heerlen, Netherlands
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p.vanrosmalen@maastri, Maastricht, Netherlands
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Open University of the Netherlands, Heerlen, Netherlands
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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.