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Submitted on: 04 October 1998.
Revised on: 08 December 1998.
Accepted on: 31 January 1999.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY
Submitted on: 03 April 2018.
Revised on: 28 July 2018.
Accepted on: 11 August 2018.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY
Submitted on: 06 September 2012.
Revised on: 27 December 2012.
Accepted on: 08 January 2013.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY
Submitted on: 03 January 2002.
Revised on: 23 January 2002.
Accepted on: 06 March 2002.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY
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Submitted on: 18 September 2008.
Revised on: 17 October 2008.
Accepted on: 05 November 2008.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY
Submitted on: 10 December 2005.
Revised on: 16 January 2006.
Accepted on: 24 February 2006.
___________________JOURNAL OF MATHEMATICAL CHEMISTRY