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JUCS - Journal of Universal Computer Science 18(20): 2771-2797
doi:
10.3217/jucs-018-20-2771
Received:
11 Jan 2011 | Approved:
30 Apr 2012 | Published:
01 Dec 2012
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Authors
Luiz F. Bittencourt 
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University of Campinas, Campinas, Brazil
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University of Campinas, Campinas, 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.