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JUCS - Journal of Universal Computer Science 18(6): 857-873
doi:
10.3217/jucs-018-06-0857
Received:
15 Oct 2011 | Approved:
15 Feb 2012 | Published:
28 Mar 2012
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Authors
Jezabel Molina-Gil 
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University of La Laguna, Tenerife, Spain
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University of La Laguna, Tenerife, 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.