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JUCS - Journal of Universal Computer Science 2(12): 797-804
doi:
10.3217/jucs-002-12-0797
Published:
28 Dec 1996
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Author
Paul M E De Bra 
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Eindhoven University of Technology, Netherlands
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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.