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Submitted on: 07 August 2016.
Revised on: 24 October 2016.
Accepted on: 15 November 2016.
___________________AMERICAN JOURNAL OF PHYSICS---AIP PUBLISHING
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Submitted on: 08 December 2000.
Revised on: 18 February 2001.
Accepted on: 29 March 2001.
___________________AMERICAN JOURNAL OF PHYSICS---AIP PUBLISHING
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Submitted on: 08 November 2002.
Revised on: 25 January 2003.
Accepted on: 19 March 2003.
___________________AMERICAN JOURNAL OF PHYSICS---AIP PUBLISHING
Submitted on: 06 January 2020.
Revised on: 18 April 2020.
Accepted on: 10 May 2020.
___________________AMERICAN JOURNAL OF PHYSICS---AIP PUBLISHING
Submitted on: 28 February 2002.
Revised on: 11 May 2002.
Accepted on: 04 July 2002.
___________________AMERICAN JOURNAL OF PHYSICS---AIP PUBLISHING