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JUCS - Journal of Universal Computer Science 10(5): 620-629
doi:
10.3217/jucs-010-05-0620
Published:
28 May 2004
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Author
Isabel A. Nepomuceno-Chamorro 
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University of Sevilla, Spain
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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.