Submitted on: 26 November 1999.
Revised on: 29 January 2000.
Accepted on: 25 March 2000.
___________________INTERNATIONAL JOURNAL OF TURBO & JET-ENGINES
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Submitted on: 02 March 2005.
Revised on: 15 June 2005.
Accepted on: 03 August 2005.
___________________INTERNATIONAL JOURNAL OF TURBO & JET-ENGINES