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Submitted on: 23 December 2012.
Revised on: 21 January 2013.
Accepted on: 08 February 2013.
PHYSICS TODAY---AMER INST PHYSICS
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Submitted on: 15 October 2016.
Revised on: 12 November 2016.
Accepted on: 25 November 2016.
PHYSICS TODAY---AMER INST PHYSICS
Submitted on: 13 November 2002.
Revised on: 09 December 2002.
Accepted on: 05 January 2003.
PHYSICS TODAY
Submitted on: 22 October 2017.
Revised on: 19 November 2017.
Accepted on: 27 November 2017.
PHYSICS TODAY---AMER INST PHYSICS
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Submitted on: 29 September 2009.
Revised on: 14 October 2009.
Accepted on: 27 October 2009.
PHYSICS TODAY
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