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JUCS - Journal of Universal Computer Science 6(9): 861-880
doi:
10.3217/jucs-006-09-0861
Published:
28 Sep 2000
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Author
Stefan Ratschan
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Research Institute for Symbolic Computation, Linz, Austria
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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.