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JUCS - Journal of Universal Computer Science 9(12): 1469-1486
doi:
10.3217/jucs-009-12-1469
Published:
28 Dec 2003
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Authors
Juan G. Cegarra-Navarro
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University Polytechnic of Cartagena, Spain
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University National Education of Distance, Madrid, Spain
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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.