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JUCS - Journal of Universal Computer Science 21(3): 483-501
doi:
10.3217/jucs-021-03-0483
Received:
30 Jun 2014 | Approved:
28 Feb 2015 | Published:
01 Mar 2015
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Authors
Guoyan Zhang 
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Shandong University, Jinan, China
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University of Wollongong, Wollongong, Australia
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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.