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JUCS - Journal of Universal Computer Science 21(11): 1425-1438
doi:
10.3217/jucs-021-11-1425
Received:
10 May 2014 | Approved:
12 Jan 2015 | Published:
01 Nov 2015
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Authors
Hsing-Wen Wang
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Changhua University of Education, Changhua, Taiwan
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National Taiwan Normal University, Taipei, Taiwan
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National Taiwan Normal University, Taipei, Taiwan
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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.