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JUCS - Journal of Universal Computer Science 5(7): 418-462
doi:
10.3217/jucs-005-07-0418
Published:
28 Jul 1999
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Author
J. Gerard Wolff 
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University of Wales, Bangor, United Kingdom
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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.