Submitted on: 21 June 2002.
Revised on: 08 August 2002.
Accepted on: 23 September 2002.
___________________European Physical Journal-Special Topics
Submitted on: 05 August 1999.
Revised on: 10 September 1999.
Accepted on: 05 October 1999.
___________________European Physical Journal-Special Topics
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Submitted on: 18 February 2002.
Revised on: 03 May 2002.
Accepted on: 18 June 2002.
___________________European Physical Journal-Special Topics
Submitted on: 17 February 2019.
Revised on: 14 June 2019.
Accepted on: 06 August 2019.
___________________European Physical Journal-Special Topics
Submitted on: 06 December 2020.
Revised on: 22 January 2021.
Accepted on: 03 March 2021.
___________________European Physical Journal-Special Topics
Submitted on: 22 September 2010.
Revised on: 03 November 2010.
Accepted on: 19 December 2010.
___________________European Physical Journal-Special Topics
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