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JUCS - Journal of Universal Computer Science 12(11): 1521-1550
doi:
10.3217/jucs-012-11-1521
Published:
28 Nov 2006
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Authors
David de Frutos Escrig 
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Universídad Complutense de Madrid, Spain
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Universídad Complutense de 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.