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Submitted on: 02 December 2024.
Revised on: 28 December 2024.
Accepted on: 29 January 2025.
___________________JOURNAL OF MODERN OPTICS---TAYLOR & FRANCIS LTD
Submitted on: 23 May 1998.
Revised on: 06 September 1998.
Accepted on: 17 October 1998.
___________________JOURNAL OF MODERN OPTICS---TAYLOR & FRANCIS LTD
Submitted on: 30 October 1998.
Revised on: 22 January 1999.
Accepted on: 14 February 1999.
___________________JOURNAL OF MODERN OPTICS---TAYLOR & FRANCIS LTD
Submitted on: 01 July 2014.
Revised on: 25 August 2014.
Accepted on: 04 October 2014.
___________________JOURNAL OF MODERN OPTICS---TAYLOR & FRANCIS LTD