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JUCS - Journal of Universal Computer Science 19(12): 1761-1791
doi:
10.3217/jucs-019-12-1761
Received:
26 Oct 2012 | Approved:
26 Jun 2013 | Published:
28 Jun 2013
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Author
Alois Paulin 
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Vienna University of Technology, Vienna, Austria
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Conflict of interest
The author has declared that no competing interests exist.
This article is freely available under the J.UCS Open Content License.