Submitted on: 01 May 2006.
Revised on: 03 June 2006.
Accepted on: 23 July 2006.
___________________European Physical Journal H---SPRINGER HEIDELBERG
http://reply.papertrans.cn/1/94/9355/9355-22.png
Submitted on: 28 April 1999.
Revised on: 15 July 1999.
Accepted on: 17 August 1999.
___________________European Physical Journal H---SPRINGER HEIDELBERG
http://reply.papertrans.cn/1/94/9355/9355-24.png
http://reply.papertrans.cn/1/94/9355/9355-25.png
Submitted on: 16 April 2021.
Revised on: 08 July 2021.
Accepted on: 26 August 2021.
___________________European Physical Journal H---SPRINGER HEIDELBERG
Submitted on: 22 February 2013.
Revised on: 29 April 2013.
Accepted on: 09 June 2013.
___________________European Physical Journal H---SPRINGER HEIDELBERG
Submitted on: 10 October 2001.
Revised on: 14 January 2002.
Accepted on: 01 March 2002.
___________________European Physical Journal H---SPRINGER HEIDELBERG
http://reply.papertrans.cn/1/94/9355/9355-29.png
Submitted on: 02 December 1999.
Revised on: 22 December 1999.
Accepted on: 13 January 2000.
___________________European Physical Journal H---SPRINGER HEIDELBERG