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Submitted on: 14 July 2012.
Revised on: 14 September 2012.
Accepted on: 12 November 2012.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY
Submitted on: 27 July 2000.
Revised on: 31 October 2000.
Accepted on: 18 November 2000.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY
Submitted on: 05 August 2018.
Revised on: 24 November 2018.
Accepted on: 26 December 2018.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY
Submitted on: 01 May 2017.
Revised on: 20 August 2017.
Accepted on: 27 September 2017.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY
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Submitted on: 25 August 2009.
Revised on: 04 October 2009.
Accepted on: 29 November 2009.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY