Submitted on: 18 April 2005.
Revised on: 17 June 2005.
Accepted on: 30 July 2005.
___________________ANNALS OF SCIENCE---TAYLOR & FRANCIS LTD
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Submitted on: 07 January 2024.
Revised on: 05 March 2024.
Accepted on: 20 April 2024.
___________________ANNALS OF SCIENCE---TAYLOR & FRANCIS LTD
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Submitted on: 05 January 2006.
Revised on: 28 February 2006.
Accepted on: 13 March 2006.
___________________ANNALS OF SCIENCE---TAYLOR & FRANCIS LTD
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