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Submitted on: 19 December 2004.
Revised on: 09 March 2005.
Accepted on: 02 April 2005.
___________________Engineering Science and Technology-An International Journal-JESTECH
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Submitted on: 20 September 2003.
Revised on: 08 January 2004.
Accepted on: 09 February 2004.
___________________Engineering Science and Technology-An International Journal-JESTECH
Submitted on: 14 March 2007.
Revised on: 23 April 2007.
Accepted on: 17 June 2007.
___________________Engineering Science and Technology-An International Journal-JESTECH