Submitted on: 16 January 2001.
Revised on: 15 April 2001.
Accepted on: 13 May 2001.
___________________Journal of Chemical Theory and Computation
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Submitted on: 02 November 2003.
Revised on: 20 January 2004.
Accepted on: 12 February 2004.
___________________Journal of Chemical Theory and Computation
Submitted on: 22 August 2010.
Revised on: 26 October 2010.
Accepted on: 19 November 2010.
___________________Journal of Chemical Theory and Computation