Submitted on: 25 March 2012.
Revised on: 01 May 2012.
Accepted on: 18 May 2012.
___________________Electronic Structure---IOP PUBLISHING LTD
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Submitted on: 02 December 2015.
Revised on: 30 December 2015.
Accepted on: 13 January 2016.
___________________Electronic Structure---IOP PUBLISHING LTD
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Submitted on: 14 September 2010.
Revised on: 22 November 2010.
Accepted on: 15 December 2010.
___________________Electronic Structure---IOP PUBLISHING LTD
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Submitted on: 03 January 2000.
Revised on: 11 April 2000.
Accepted on: 27 May 2000.
___________________Electronic Structure---IOP PUBLISHING LTD