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JUCS - Journal of Universal Computer Science 19(3): 428-456
doi:
10.3217/jucs-019-03-0428
Received:
31 Mar 2012 | Approved:
28 Jan 2013 | Published:
01 Feb 2013
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Authors
Martin Stein 
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Karlsruhe Institute of Technology, Karlsruhe, Germany
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Karlsruhe Institute of Technology, Karlsruhe, 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.