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Submitted on: 25 April 2002.
Revised on: 13 June 2002.
Accepted on: 26 June 2002.
___________________ANNALS OF SCIENCE---TAYLOR & FRANCIS LTD
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Submitted on: 03 May 2018.
Revised on: 02 August 2018.
Accepted on: 29 August 2018.
___________________ANNALS OF SCIENCE---TAYLOR & FRANCIS LTD
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Submitted on: 16 December 2007.
Revised on: 05 March 2008.
Accepted on: 06 April 2008.
___________________ANNALS OF SCIENCE---TAYLOR & FRANCIS LTD
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Submitted on: 24 June 2003.
Revised on: 03 September 2003.
Accepted on: 01 October 2003.
___________________ANNALS OF SCIENCE---TAYLOR & FRANCIS LTD