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JUCS - Journal of Universal Computer Science 18(2): 264-285
doi:
10.3217/jucs-018-02-0264
Received:
03 Nov 2009 | Approved:
06 Dec 2011 | Published:
18 Jan 2012
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Author
Joaquin Olivares 
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University of Cordoba, Cordoba, 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.