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JUCS - Journal of Universal Computer Science 10(9): 1294-1301
doi:
10.3217/jucs-010-09-1294
Published:
28 Sep 2004
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Author
Sergiu Rudeanu 
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Faculty of Mathematics and Computer Science, The University of Bucharest, 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.