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JUCS - Journal of Universal Computer Science 19(2): 254-280
doi:
10.3217/jucs-019-02-0254
Received:
07 May 2012 | Approved:
31 Dec 2012 | Published:
28 Jan 2013
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Authors
Fabiane Barreto Vavassori Benitti 
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Universidade do Vale do Itajaí, Itajaí, Brazil
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Universidade do Vale do Itajaí, Itajaí, 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.