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Submitted on: 19 March 2005.
Revised on: 12 April 2005.
Accepted on: 10 June 2005.
___________________Africa Spectrum---SAGE PUBLICATIONS INC
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Submitted on: 16 December 2022.
Revised on: 28 January 2023.
Accepted on: 22 February 2023.
___________________Africa Spectrum---SAGE PUBLICATIONS INC