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JUCS - Journal of Universal Computer Science 21(7): 935-958
doi:
10.3217/jucs-021-07-0935
Received:
04 Aug 2014 | Approved:
26 Jun 2015 | Published:
01 Jul 2015
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Authors
Angela Mendoza 
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Rey Juan Carlos University, Madrid, Spain
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Rey Juan Carlos University, Madrid, Spain
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Rey Juan Carlos University, Madrid, 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.