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JUCS - Journal of Universal Computer Science 7(5): 447-455
doi:
10.3217/jucs-007-05-0447
Published:
28 May 2001
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Author
Reinhard Posch 
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Graz University of Technology, Graz, 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.