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JUCS - Journal of Universal Computer Science 7(11): 1006-1023
doi:
10.3217/jucs-007-11-1006
Published:
28 Nov 2001
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Authors
Egon Börger 
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University of Pisa, Pisa, Italy
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Dipartimento di Informatica, Università di Pisa, Pisa, Italy
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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.