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JUCS - Journal of Universal Computer Science 18(14): 1906-1932
doi:
10.3217/jucs-018-14-1906
Received:
22 Dec 2010 | Approved:
13 Jul 2012 | Published:
28 Jul 2012
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Authors
Antonio L. Bajuelos 
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University of Aveiro, Aveiro, Portugal
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Universidad Pontifícia Comillas de Madrid, Madrid, Spain
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Universidad Politécnica de Madrid, Madrid, Spain
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University of Aveiro, Aveiro, Portugal
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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.