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Submitted on: 29 March 2023.
Revised on: 13 July 2023.
Accepted on: 14 August 2023.
___________________Annals of Mathematical Sciences and Applications
Submitted on: 14 April 2013.
Revised on: 16 June 2013.
Accepted on: 07 July 2013.
___________________Annals of Mathematical Sciences and Applications
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Submitted on: 20 December 1999.
Revised on: 12 January 2000.
Accepted on: 12 February 2000.
___________________Annals of Mathematical Sciences and Applications
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Submitted on: 24 April 2009.
Revised on: 06 June 2009.
Accepted on: 04 August 2009.
___________________Annals of Mathematical Sciences and Applications
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Submitted on: 01 October 2006.
Revised on: 22 November 2006.
Accepted on: 12 December 2006.
___________________Annals of Mathematical Sciences and Applications