Submitted on: 09 February 1999.
Revised on: 14 March 1999.
Accepted on: 06 May 1999.
___________________Journal of Optics---IOP PUBLISHING LTD
Submitted on: 21 November 2003.
Revised on: 15 February 2004.
Accepted on: 11 March 2004.
___________________Journal of Optics---IOP PUBLISHING LTD
Submitted on: 18 April 2008.
Revised on: 15 July 2008.
Accepted on: 05 September 2008.
___________________Journal of Optics---IOP PUBLISHING LTD
Submitted on: 06 January 2022.
Revised on: 28 February 2022.
Accepted on: 18 April 2022.
___________________Journal of Optics---IOP PUBLISHING LTD
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Submitted on: 03 October 2009.
Revised on: 15 November 2009.
Accepted on: 17 December 2009.
___________________Journal of Optics---IOP PUBLISHING LTD
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Submitted on: 24 February 2010.
Revised on: 07 June 2010.
Accepted on: 30 June 2010.
___________________Journal of Optics---IOP PUBLISHING LTD
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