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JUCS - Journal of Universal Computer Science 15(7): 1496-1507
doi:
10.3217/jucs-015-07-1496
Published:
01 Apr 2009
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Authors
Lucila Maria Costi Santarosa 
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Universidade Federal do Rio Grande do Sul, Porto Alegre,
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Universidade Federal do Rio Grande do Sul, Porto Alegre, 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.