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Submitted on: 21 November 1998.
Revised on: 11 March 1999.
Accepted on: 19 April 1999.
___________________APPLIED SURFACE SCIENCE---ELSEVIER
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Submitted on: 03 June 2008.
Revised on: 09 July 2008.
Accepted on: 30 August 2008.
___________________APPLIED SURFACE SCIENCE---ELSEVIER
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