Submitted on: 20 December 2007.
Revised on: 11 February 2008.
Accepted on: 19 March 2008.
___________________Journal of Mathematics Mechanics and Computer Science
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Submitted on: 17 April 2012.
Revised on: 17 May 2012.
Accepted on: 22 June 2012.
___________________Journal of Mathematics Mechanics and Computer Science
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Submitted on: 13 April 2024.
Revised on: 28 July 2024.
Accepted on: 17 August 2024.
___________________Journal of Mathematics Mechanics and Computer Science
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Submitted on: 16 September 2024.
Revised on: 02 November 2024.
Accepted on: 28 December 2024.
___________________Journal of Mathematics Mechanics and Computer Science