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Submitted on: 11 February 2002.
Revised on: 14 April 2002.
Accepted on: 08 June 2002.
___________________APPLIED SURFACE SCIENCE---ELSEVIER
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Submitted on: 08 August 2004.
Revised on: 01 October 2004.
Accepted on: 21 November 2004.
___________________APPLIED SURFACE SCIENCE---ELSEVIER
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