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JUCS - Journal of Universal Computer Science 20(5): 797-821
doi:
10.3217/jucs-020-05-0797
Received:
28 Jul 2013 | Approved:
15 Feb 2013 | Published:
01 May 2014
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Authors
Luiz Laerte Nunes Da Silva Junior 
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Universidade Federal Fluminense, Niteró, Brazil
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Universidade Federal Fluminense, Niteró, Brazil
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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.