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Submitted on: 25 April 1998.
Revised on: 03 August 1998.
Accepted on: 15 August 1998.
___________________CHEMICAL PHYSICS LETTERS---ELSEVIER
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Submitted on: 21 November 2011.
Revised on: 18 December 2011.
Accepted on: 29 January 2012.
___________________CHEMICAL PHYSICS LETTERS---ELSEVIER