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JUCS - Journal of Universal Computer Science 3(11): 1148-1161
doi:
10.3217/jucs-003-11-1148
Published:
28 Nov 1997
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Authors
Douglas S. Bridges 
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Department of Mathematics, University of Waikato, Hamilton, New Zealand
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Department of Mathematics, University of Waikato, New Zealand
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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.