Submitted on: 16 March 2009.
Revised on: 09 May 2009.
Accepted on: 05 July 2009.
___________________Electronic Journal of Linear Algebra
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Submitted on: 08 October 2015.
Revised on: 25 November 2015.
Accepted on: 06 January 2016.
___________________Electronic Journal of Linear Algebra
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Submitted on: 13 August 2020.
Revised on: 01 December 2020.
Accepted on: 30 December 2020.
___________________Electronic Journal of Linear Algebra