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JUCS - Journal of Universal Computer Science 9(12): 1519-1532
doi:
10.3217/jucs-009-12-1519
Published:
28 Dec 2003
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Author
Eduardo Tomé
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High Institute for Social Service, Beja, Portugal
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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.