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Submitted on: 10 September 2013.
Revised on: 19 December 2013.
Accepted on: 07 January 2014.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY
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Submitted on: 22 April 2008.
Revised on: 15 May 2008.
Accepted on: 10 June 2008.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY
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Submitted on: 13 July 1999.
Revised on: 24 August 1999.
Accepted on: 20 September 1999.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY
Submitted on: 07 July 2020.
Revised on: 25 September 2020.
Accepted on: 16 October 2020.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY