Submitted on: 06 April 2013.
Revised on: 29 April 2013.
Accepted on: 13 May 2013.
___________________Electronic Structure---IOP PUBLISHING LTD
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Submitted on: 01 October 2020.
Revised on: 29 October 2020.
Accepted on: 24 November 2020.
___________________Electronic Structure---IOP PUBLISHING LTD
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Submitted on: 01 April 2019.
Revised on: 07 June 2019.
Accepted on: 02 August 2019.
___________________Electronic Structure---IOP PUBLISHING LTD
Submitted on: 16 July 1998.
Revised on: 22 October 1998.
Accepted on: 18 December 1998.
___________________Electronic Structure---IOP PUBLISHING LTD
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Submitted on: 24 July 2000.
Revised on: 08 October 2000.
Accepted on: 03 December 2000.
___________________Electronic Structure---IOP PUBLISHING LTD
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