Submitted on: 03 March 1998.
Revised on: 18 May 1998.
Accepted on: 25 June 1998.
___________________JOURNAL OF PHYSICS D-APPLIED PHYSICS
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Submitted on: 30 July 2014.
Revised on: 10 September 2014.
Accepted on: 26 October 2014.
___________________JOURNAL OF PHYSICS D-APPLIED PHYSICS
Submitted on: 23 July 2013.
Revised on: 14 September 2013.
Accepted on: 10 November 2013.
___________________JOURNAL OF PHYSICS D-APPLIED PHYSICS
Submitted on: 18 November 1999.
Revised on: 23 December 1999.
Accepted on: 29 January 2000.
___________________JOURNAL OF PHYSICS D-APPLIED PHYSICS
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Submitted on: 13 July 2008.
Revised on: 07 September 2008.
Accepted on: 01 November 2008.
___________________JOURNAL OF PHYSICS D-APPLIED PHYSICS
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