Submitted on: 21 September 1998.
Revised on: 06 November 1998.
Accepted on: 28 December 1998.
___________________Journal of Molecular Structure
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Submitted on: 13 July 2007.
Revised on: 04 August 2007.
Accepted on: 15 September 2007.
___________________Journal of Molecular Structure
Submitted on: 29 March 2006.
Revised on: 05 June 2006.
Accepted on: 02 July 2006.
___________________Journal of Molecular Structure
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