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JUCS - Journal of Universal Computer Science 13(11): 1707-1721
doi:
10.3217/jucs-013-11-1707
Published:
28 Nov 2007
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Author
Gheorghe Păun 
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Institute of Mathematics of the Romanian Academy, 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.