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Submitted on: 31 July 1998.
Revised on: 22 September 1998.
Accepted on: 24 October 1998.
___________________European Physical Journal H---SPRINGER HEIDELBERG
Submitted on: 13 September 2003.
Revised on: 07 December 2003.
Accepted on: 28 December 2003.
___________________European Physical Journal H---SPRINGER HEIDELBERG
Submitted on: 01 January 2022.
Revised on: 13 February 2022.
Accepted on: 31 March 2022.
___________________European Physical Journal H---SPRINGER HEIDELBERG
Submitted on: 01 January 2014.
Revised on: 24 January 2014.
Accepted on: 12 March 2014.
___________________European Physical Journal H---SPRINGER HEIDELBERG
Submitted on: 21 September 2023.
Revised on: 24 October 2023.
Accepted on: 20 November 2023.
___________________European Physical Journal H---SPRINGER HEIDELBERG
Submitted on: 23 October 1999.
Revised on: 27 November 1999.
Accepted on: 15 December 1999.
___________________European Physical Journal H---SPRINGER HEIDELBERG
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Submitted on: 06 March 2020.
Revised on: 26 June 2020.
Accepted on: 07 July 2020.
___________________European Physical Journal H---SPRINGER HEIDELBERG