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JUCS - Journal of Universal Computer Science 15(14): 2881-2893
doi:
10.3217/jucs-015-14-2881
Published:
01 Aug 2009
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Author
Javier Herranz 
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Universitat Politècnica de Catalunya, Barcelona, 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.