Submitted on: 08 May 2011.
Revised on: 11 June 2011.
Accepted on: 13 July 2011.
___________________Iranian Journal of Mathematical Chemistry
Submitted on: 29 October 2008.
Revised on: 29 November 2008.
Accepted on: 22 December 2008.
___________________Iranian Journal of Mathematical Chemistry
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Submitted on: 19 April 2009.
Revised on: 26 July 2009.
Accepted on: 07 September 2009.
___________________Iranian Journal of Mathematical Chemistry
Submitted on: 07 November 2009.
Revised on: 05 December 2009.
Accepted on: 26 December 2009.
___________________Iranian Journal of Mathematical Chemistry
Submitted on: 31 July 1998.
Revised on: 11 November 1998.
Accepted on: 24 November 1998.
___________________Iranian Journal of Mathematical Chemistry
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Submitted on: 15 November 2010.
Revised on: 13 December 2010.
Accepted on: 09 January 2011.
___________________Iranian Journal of Mathematical Chemistry