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JUCS - Journal of Universal Computer Science 8(3): 382-395
doi:
10.3217/jucs-008-03-0382
Published:
28 Mar 2002
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Author
Vasco Brattka 
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Theoretische Informatik 1, Informatikzentrum FernUniversität, Hagen, Germany
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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.