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Submitted on: 20 May 2011.
Revised on: 12 June 2011.
Accepted on: 15 July 2011.
___________________Journal of Mathematics and Computer Science-JMCS
Submitted on: 07 March 2003.
Revised on: 16 June 2003.
Accepted on: 29 June 2003.
___________________Journal of Mathematics and Computer Science-JMCS
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Submitted on: 09 April 2024.
Revised on: 08 May 2024.
Accepted on: 21 June 2024.
___________________Journal of Mathematics and Computer Science-JMCS
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Submitted on: 29 April 2010.
Revised on: 19 August 2010.
Accepted on: 01 October 2010.
___________________Journal of Mathematics and Computer Science-JMCS
Submitted on: 27 September 2002.
Revised on: 03 November 2002.
Accepted on: 31 December 2002.
___________________Journal of Mathematics and Computer Science-JMCS
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