Submitted on: 13 September 2019.
Revised on: 10 January 2020.
Accepted on: 26 February 2020.
___________________Electronic Structure---IOP PUBLISHING LTD
Submitted on: 21 February 2002.
Revised on: 19 May 2002.
Accepted on: 21 June 2002.
___________________Electronic Structure---IOP PUBLISHING LTD
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Submitted on: 07 July 2013.
Revised on: 23 October 2013.
Accepted on: 07 December 2013.
___________________Electronic Structure---IOP PUBLISHING LTD