Submitted on: 10 June 2000.
Revised on: 13 July 2000.
Accepted on: 02 August 2000.
___________________BULLETIN OF THE ATOMIC SCIENTISTS
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Submitted on: 04 October 2007.
Revised on: 03 November 2007.
Accepted on: 29 November 2007.
___________________BULLETIN OF THE ATOMIC SCIENTISTS
Submitted on: 29 April 2001.
Revised on: 30 July 2001.
Accepted on: 13 September 2001.
___________________BULLETIN OF THE ATOMIC SCIENTISTS