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Submitted on: 12 April 2003.
Revised on: 11 May 2003.
Accepted on: 01 June 2003.
___________________JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Submitted on: 15 July 2022.
Revised on: 14 September 2022.
Accepted on: 09 November 2022.
___________________JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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