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JUCS - Journal of Universal Computer Science 12(7): 828-848
doi:
10.3217/jucs-012-07-0828
Published:
28 Jul 2006
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Authors
Nuno F. Rodrigues 
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Universidade do Minho, Portugal
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Universidade do Minho, Portugal
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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.