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Submitted on: 30 April 2017.
Revised on: 01 August 2017.
Accepted on: 10 September 2017.
___________________JOURNAL OF ELECTROSTATICS---ELSEVIER
Submitted on: 16 September 2010.
Revised on: 04 November 2010.
Accepted on: 23 November 2010.
___________________JOURNAL OF ELECTROSTATICS---ELSEVIER
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Submitted on: 25 February 2006.
Revised on: 19 April 2006.
Accepted on: 05 May 2006.
___________________JOURNAL OF ELECTROSTATICS---ELSEVIER
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Submitted on: 03 November 2010.
Revised on: 16 January 2011.
Accepted on: 22 February 2011.
___________________JOURNAL OF ELECTROSTATICS---ELSEVIER