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JUCS - Journal of Universal Computer Science 25(13): 1668-1686
doi:
10.3217/jucs-025-13-1668
Received:
06 Jul 2018 | Approved:
20 Nov 2019 | Published:
28 Dec 2019
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Authors
George-Petru Ciordas-Hertel 
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DIPF - Leibniz Institute for Research and Information in Education, Frankfurt am Main, Germany
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DIPF - Leibniz Institute for Research and Information in Education, Frankfurt am Main, Germany
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DIPF - Leibniz Institute for Research and Information in Education Frankfurt am Main, Germany, Johann Wolfgang Goethe-Universitat, Germany and Open Universiteit, Heerlen,
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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.