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JUCS - Journal of Universal Computer Science 16(4): 507-518
doi:
10.3217/jucs-016-04-0507
Published:
28 Feb 2010
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Author
Kurt Dietrich 
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Graz University of Technology, Graz, Austria
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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.