Submitted on: 09 June 2010.
Revised on: 23 September 2010.
Accepted on: 31 October 2010.
___________________JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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Submitted on: 23 February 1998.
Revised on: 27 May 1998.
Accepted on: 14 July 1998.
___________________JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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Submitted on: 23 September 2020.
Revised on: 03 November 2020.
Accepted on: 24 December 2020.
___________________JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS