Submitted on: 26 March 2008.
Revised on: 26 June 2008.
Accepted on: 16 August 2008.
___________________CONTEMPORARY PHYSICS---TAYLOR & FRANCIS LTD
Submitted on: 28 February 2020.
Revised on: 30 March 2020.
Accepted on: 30 April 2020.
___________________CONTEMPORARY PHYSICS---TAYLOR & FRANCIS LTD
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Submitted on: 30 January 2011.
Revised on: 14 May 2011.
Accepted on: 08 July 2011.
___________________CONTEMPORARY PHYSICS---TAYLOR & FRANCIS LTD
Submitted on: 21 June 2006.
Revised on: 06 October 2006.
Accepted on: 26 November 2006.
___________________CONTEMPORARY PHYSICS---TAYLOR & FRANCIS LTD
Submitted on: 01 September 2008.
Revised on: 04 October 2008.
Accepted on: 07 November 2008.
___________________CONTEMPORARY PHYSICS---TAYLOR & FRANCIS LTD