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JUCS - Journal of Universal Computer Science 5(9): 588-598
doi:
10.3217/jucs-005-09-0588
Published:
28 Sep 1999
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Authors
Ion Petre 
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Turku Centre for Computer Science and Department of Mathematics, University of Turku, Turku, Finland
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Turku Centre for Computer Science and Department of Computer Science, Abo Akademi University, Finland
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Conflict of interest
The authors have declared that no competing interests exist.
This article is freely available under the J.UCS Open Content License.