Submitted on: 27 November 2001.
Revised on: 31 December 2001.
Accepted on: 17 January 2002.
___________________JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Submitted on: 13 August 2018.
Revised on: 11 September 2018.
Accepted on: 25 September 2018.
___________________JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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Submitted on: 25 June 2002.
Revised on: 10 October 2002.
Accepted on: 18 November 2002.
___________________JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Submitted on: 21 December 2000.
Revised on: 13 March 2001.
Accepted on: 29 March 2001.
___________________JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Submitted on: 22 November 2010.
Revised on: 19 January 2011.
Accepted on: 09 February 2011.
___________________JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS