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Notice       Retraction notice       Applied Mathematical Sciences, Vol. 8, 2014, no. 96, 4797
      http://dx.doi.org/10.12988/ams.2014.42498
Copyright © 2014 Hikari Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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