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JUCS - Journal of Universal Computer Science 19(15): 2224-2240
doi:
10.3217/jucs-019-15-2224
Received:
15 May 2013 | Approved:
30 Aug 2013 | Published:
01 Sep 2013
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Authors
Wedad Hussein 
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Ain Shams University, Cairo, Egypt
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Ain Shams University, Cairo, Egypt
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King Abdulaziz University, Jeddah, Saudi Arabia
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Ain Shams University, Cairo, Egypt
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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.