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Submitted on: 19 December 2000.
Revised on: 14 March 2001.
Accepted on: 27 March 2001.
___________________Advances in Physics-X---TAYLOR & FRANCIS LTD
Submitted on: 02 January 2005.
Revised on: 28 March 2005.
Accepted on: 18 May 2005.
___________________Advances in Physics-X---TAYLOR & FRANCIS LTD
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