Submitted on: 10 November 2005.
Revised on: 31 January 2006.
Accepted on: 18 February 2006.
___________________International Journal of Engine Research
Submitted on: 25 June 2001.
Revised on: 20 September 2001.
Accepted on: 01 October 2001.
___________________International Journal of Engine Research
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Submitted on: 30 December 2009.
Revised on: 20 January 2010.
Accepted on: 02 February 2010.
___________________International Journal of Engine Research