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JUCS - Journal of Universal Computer Science 20(4): 534-560
doi:
10.3217/jucs-020-04-0534
Received:
21 Jan 2014 | Approved:
28 Mar 2013 | Published:
01 Apr 2014
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Authors
Patricia Matsumoto 
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Instituto Tecnológico de Aeronáutica, São José dos Campos, Brazil
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Instituto Tecnológico de Aeronáutica, São José dos Campos, 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.