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Submitted on: 20 December 2018.
Revised on: 16 January 2019.
Accepted on: 15 February 2019.
___________________EUROPEAN JOURNAL OF PHYSICS---IOP PUBLISHING LTD
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Submitted on: 28 June 2002.
Revised on: 31 August 2002.
Accepted on: 10 September 2002.
___________________EUROPEAN JOURNAL OF PHYSICS---IOP PUBLISHING LTD
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Submitted on: 22 May 2022.
Revised on: 09 September 2022.
Accepted on: 26 October 2022.
___________________EUROPEAN JOURNAL OF PHYSICS---IOP PUBLISHING LTD
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