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JUCS - Journal of Universal Computer Science 19(3): 383-405
doi:
10.3217/jucs-019-03-0383
Received:
07 Feb 2012 | Approved:
28 Jan 2012 | Published:
01 Feb 2013
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Authors
Christin Seifert 
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Passau University, Passau, 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.