Submitted on: 07 February 1999.
Revised on: 27 March 1999.
Accepted on: 13 May 1999.
___________________International Journal of Innovation Science
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Submitted on: 29 May 2013.
Revised on: 15 September 2013.
Accepted on: 14 October 2013.
___________________International Journal of Innovation Science
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Submitted on: 31 August 2003.
Revised on: 07 November 2003.
Accepted on: 22 November 2003.
___________________International Journal of Innovation Science
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