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Submitted on: 15 February 1999.
Revised on: 25 March 1999.
Accepted on: 06 April 1999.
___________________ANNALS OF SCIENCE---TAYLOR & FRANCIS LTD
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Submitted on: 07 December 2011.
Revised on: 04 January 2012.
Accepted on: 27 January 2012.
___________________ANNALS OF SCIENCE---TAYLOR & FRANCIS LTD
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