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JUCS - Journal of Universal Computer Science 20(3): 302-328
doi:
10.3217/jucs-020-03-0302
Received:
04 Feb 2013 | Approved:
27 Feb 2014 | Published:
01 Mar 2014
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Authors
Shang-Pin Ma 
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National Taiwan Ocean University, Keelung, Taiwan
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National Taiwan Ocean University, Keelung, Taiwan
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National Taiwan Ocean University, Keelung, Taiwan
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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.