Submitted on: 10 January 2009.
Revised on: 23 February 2009.
Accepted on: 11 March 2009.
___________________International Journal of Engineering Research in Africa
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Submitted on: 15 March 1998.
Revised on: 02 June 1998.
Accepted on: 04 July 1998.
___________________International Journal of Engineering Research in Africa
Submitted on: 21 September 2013.
Revised on: 10 December 2013.
Accepted on: 18 January 2014.
___________________International Journal of Engineering Research in Africa
Submitted on: 27 October 2022.
Revised on: 13 February 2023.
Accepted on: 21 March 2023.
___________________International Journal of Engineering Research in Africa
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