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Submitted on: 25 December 2004.
Revised on: 21 February 2005.
Accepted on: 19 April 2005.
___________________International Journal of Mathematics and Physics
Submitted on: 03 July 2004.
Revised on: 27 August 2004.
Accepted on: 05 October 2004.
___________________International Journal of Mathematics and Physics
Submitted on: 30 April 2006.
Revised on: 08 June 2006.
Accepted on: 11 July 2006.
___________________International Journal of Mathematics and Physics
Submitted on: 22 March 2012.
Revised on: 19 June 2012.
Accepted on: 12 August 2012.
___________________International Journal of Mathematics and Physics
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