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Submitted on: 12 November 1998.
Revised on: 12 February 1999.
Accepted on: 23 March 1999.
___________________JOURNAL OF APPLIED ELECTROCHEMISTRY
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Submitted on: 28 June 2004.
Revised on: 20 August 2004.
Accepted on: 03 September 2004.
___________________JOURNAL OF APPLIED ELECTROCHEMISTRY