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JUCS - Journal of Universal Computer Science 20(2): 240-253
doi:
10.3217/jucs-020-02-0240
Received:
02 Mar 2013 | Approved:
30 Oct 2013 | Published:
01 Feb 2014
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Authors
Daniel Perez-Gonzalez 
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University of Cantabria, Cantabria, Spain
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University of Murcia, Murcia, Spain
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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.