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Submitted on: 29 July 1999.
Revised on: 14 November 1999.
Accepted on: 24 December 1999.
___________________FLY---TAYLOR & FRANCIS INC
Submitted on: 06 June 2021.
Revised on: 27 August 2021.
Accepted on: 14 October 2021.
___________________FLY---TAYLOR & FRANCIS INC
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