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JUCS - Journal of Universal Computer Science 5(9): 508-520
doi:
10.3217/jucs-005-09-0508
Published:
28 Sep 1999
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Author
Symeon Bozapalidis 
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Department of Mathematics, Aristotle University of Thessaloniki, Thessaloniki, 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.