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JUCS - Journal of Universal Computer Science 4(8): 675-689
doi:
10.3217/jucs-004-08-0675
Published:
28 Aug 1998
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Author
Ville Leppänen 
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Department of Computer Science, University of Turku, Finland
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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.