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Submitted on: 15 August 2000.
Revised on: 01 December 2000.
Accepted on: 24 January 2001.
___________________INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
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Submitted on: 26 February 2009.
Revised on: 23 May 2009.
Accepted on: 23 June 2009.
___________________INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY