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Submitted on: 04 April 2014.
Revised on: 13 June 2014.
Accepted on: 29 June 2014.
___________________INTERNATIONAL JOURNAL OF MATHEMATICS AND MATHEMATICAL SCIENCES
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Submitted on: 05 October 2003.
Revised on: 01 December 2003.
Accepted on: 02 January 2004.
___________________INTERNATIONAL JOURNAL OF MATHEMATICS AND MATHEMATICAL SCIENCES
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