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Submitted on: 13 January 1999.
Revised on: 04 March 1999.
Accepted on: 23 March 1999.
___________________CONTEMPORARY PHYSICS---TAYLOR & FRANCIS LTD
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Submitted on: 14 June 2020.
Revised on: 10 September 2020.
Accepted on: 22 October 2020.
___________________CONTEMPORARY PHYSICS---TAYLOR & FRANCIS LTD
Submitted on: 20 March 2001.
Revised on: 21 June 2001.
Accepted on: 09 August 2001.
___________________CONTEMPORARY PHYSICS---TAYLOR & FRANCIS LTD
Submitted on: 11 May 2024.
Revised on: 19 July 2024.
Accepted on: 02 September 2024.
___________________CONTEMPORARY PHYSICS---TAYLOR & FRANCIS LTD
Submitted on: 21 December 2024.
Revised on: 24 March 2025.
Accepted on: 17 April 2025.
___________________CONTEMPORARY PHYSICS---TAYLOR & FRANCIS LTD
Submitted on: 05 September 2017.
Revised on: 01 January 2018.
Accepted on: 23 February 2018.
___________________CONTEMPORARY PHYSICS---TAYLOR & FRANCIS LTD