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JUCS - Journal of Universal Computer Science 18(17): 2432-2451
doi:
10.3217/jucs-018-17-2432
Received:
16 Jan 2011 | Approved:
29 Aug 2012 | Published:
01 Sep 2012
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Author
Ji Ma 
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Software Competence Center Hagenberg, Hagenberg, 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.