Submitted on: 24 May 2019.
Revised on: 17 August 2019.
Accepted on: 27 August 2019.
___________________Journal of Optics---IOP PUBLISHING LTD
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Submitted on: 15 June 2002.
Revised on: 14 August 2002.
Accepted on: 30 September 2002.
___________________Journal of Optics---IOP PUBLISHING LTD
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Submitted on: 17 August 1999.
Revised on: 14 October 1999.
Accepted on: 26 October 1999.
___________________Journal of Optics---IOP PUBLISHING LTD
Submitted on: 19 August 2017.
Revised on: 20 October 2017.
Accepted on: 19 November 2017.
___________________Journal of Optics---IOP PUBLISHING LTD
Submitted on: 05 September 2014.
Revised on: 23 November 2014.
Accepted on: 27 December 2014.
___________________Journal of Optics---IOP PUBLISHING LTD
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