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JUCS - Journal of Universal Computer Science 3(7): 813-820
doi:
10.3217/jucs-003-07-0813
Published:
28 Jul 1997
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Author
Ioan Tomescu 
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Faculty of Mathematics, University of Bucharest, Romania
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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.