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JUCS - Journal of Universal Computer Science 16(14): 1902-1911
doi:
10.3217/jucs-016-14-1902
Published:
28 Jul 2010
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Author
Esko Ukkonen
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University of Helsinki, Helsinki, Finland
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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.