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JUCS - Journal of Universal Computer Science 14(21): 3465-3480
doi:
10.3217/jucs-014-21-3465
Published:
01 Dec 2008
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Authors
Ricardo Santos 
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Dom Bosco Catholic University, Campo Grande, Brazil
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State University of Campina, Campinas, Brazil
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State University of Campina, 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.