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JUCS - Journal of Universal Computer Science 15(1): 304-354
doi:
10.3217/jucs-015-01-0304
Published:
01 Jan 2009
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Authors
Attila Sali
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Alfréd Rényi Institute of Mathematics, Budapest, Hungary
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Johannes Kepler University Linz, Linz, Austria
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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.