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JUCS - Journal of Universal Computer Science 13(12): 1908-1935
doi:
10.3217/jucs-013-12-1908
Published:
01 Dec 2007
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Authors
Raquel Trillo 
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University of Zaragoza, Zaragoza, Spain
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University of Zaragoza, Zaragoza, Spain
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University of Zaragoza, 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.