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Submitted on: 21 April 1998.
Revised on: 24 May 1998.
Accepted on: 03 July 1998.
___________________Advances in Condensed Matter Physics
Submitted on: 26 October 2008.
Revised on: 05 February 2009.
Accepted on: 03 March 2009.
___________________Advances in Condensed Matter Physics
Submitted on: 11 September 2010.
Revised on: 24 December 2010.
Accepted on: 17 February 2011.
___________________Advances in Condensed Matter Physics
Submitted on: 30 June 2023.
Revised on: 01 August 2023.
Accepted on: 11 September 2023.
___________________Advances in Condensed Matter Physics
Submitted on: 09 July 2009.
Revised on: 25 August 2009.
Accepted on: 12 September 2009.
___________________Advances in Condensed Matter Physics