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JUCS - Journal of Universal Computer Science 9(8): 813-828
doi:
10.3217/jucs-009-08-0813
Published:
28 Aug 2003
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Author
Rafael Dueire Lins 
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Universidade Federal de Pernambuco, Recife, Brazil
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Conflict of interest
The author has declared that no competing interests exist.
This article is freely available under the J.UCS Open Content License.