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Notice       Retraction notice       Applied Mathematical Sciences, Vol. 7, 2013, no. 100, 5001
      http://dx.doi.org/10.12988/ams.2013.301
Copyright © 2013 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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