Submitted on: 29 January 2015.
Revised on: 17 March 2015.
Accepted on: 02 April 2015.
___________________Applied Numerical Mathematics---ELSEVIER
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Submitted on: 16 October 2016.
Revised on: 03 February 2017.
Accepted on: 23 March 2017.
___________________Applied Numerical Mathematics---ELSEVIER
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Submitted on: 14 April 2010.
Revised on: 02 July 2010.
Accepted on: 09 August 2010.
___________________Applied Numerical Mathematics---ELSEVIER
Submitted on: 24 July 2000.
Revised on: 11 September 2000.
Accepted on: 15 October 2000.
___________________Applied Numerical Mathematics---ELSEVIER
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