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Submitted on: 22 January 2019.
Revised on: 16 March 2019.
Accepted on: 11 April 2019.
___________________International Journal of Mathematics for Industry
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Submitted on: 18 September 2006.
Revised on: 10 November 2006.
Accepted on: 29 December 2006.
___________________International Journal of Mathematics for Industry
Submitted on: 27 March 2008.
Revised on: 21 July 2008.
Accepted on: 14 September 2008.
___________________International Journal of Mathematics for Industry
Submitted on: 04 June 2009.
Revised on: 23 August 2009.
Accepted on: 09 October 2009.
___________________International Journal of Mathematics for Industry
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Submitted on: 28 June 2021.
Revised on: 20 July 2021.
Accepted on: 13 September 2021.
___________________International Journal of Mathematics for Industry
Submitted on: 09 April 2009.
Revised on: 21 May 2009.
Accepted on: 06 July 2009.
___________________International Journal of Mathematics for Industry
Submitted on: 07 August 2007.
Revised on: 30 September 2007.
Accepted on: 02 November 2007.
___________________International Journal of Mathematics for Industry