Submitted on: 25 September 2012.
Revised on: 08 December 2012.
Accepted on: 02 January 2013.
___________________Electronic Structure---IOP PUBLISHING LTD
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Submitted on: 01 December 2017.
Revised on: 04 March 2018.
Accepted on: 01 May 2018.
___________________Electronic Structure---IOP PUBLISHING LTD
Submitted on: 10 June 2005.
Revised on: 21 July 2005.
Accepted on: 02 September 2005.
___________________Electronic Structure---IOP PUBLISHING LTD
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