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Submitted on: 18 January 2009.
Revised on: 26 February 2009.
Accepted on: 11 April 2009.
___________________High Voltage---WILEY
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Submitted on: 19 November 2010.
Revised on: 02 March 2011.
Accepted on: 14 March 2011.
___________________High Voltage---WILEY
Submitted on: 17 January 2003.
Revised on: 13 March 2003.
Accepted on: 30 April 2003.
___________________High Voltage---WILEY
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