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Submitted on: 01 January 2003.
Revised on: 10 February 2003.
Accepted on: 22 March 2003.
___________________APPLIED CATALYSIS A-GENERAL---ELSEVIER
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Submitted on: 24 June 2008.
Revised on: 25 July 2008.
Accepted on: 09 September 2008.
___________________APPLIED CATALYSIS A-GENERAL---ELSEVIER
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