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JUCS - Journal of Universal Computer Science 14(17): 2897-2908
doi:
10.3217/jucs-014-17-2897
Published:
28 Sep 2008
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Author
Symeon Retalis 
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University of Piraeus, Piraeus, Greece
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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.