Submitted on: 29 December 2000.
Revised on: 08 February 2001.
Accepted on: 07 April 2001.
___________________JOM---SPRINGER
Submitted on: 07 May 1999.
Revised on: 30 August 1999.
Accepted on: 15 October 1999.
___________________JOM---SPRINGER
http://reply.papertrans.cn/2/150/14931/14931-23.png
http://reply.papertrans.cn/2/150/14931/14931-24.png
Submitted on: 16 April 2014.
Revised on: 28 July 2014.
Accepted on: 26 August 2014.
___________________JOM---SPRINGER
http://reply.papertrans.cn/2/150/14931/14931-26.png
Submitted on: 10 March 2004.
Revised on: 24 April 2004.
Accepted on: 21 May 2004.
___________________JOM---SPRINGER
http://reply.papertrans.cn/2/150/14931/14931-28.png
http://reply.papertrans.cn/2/150/14931/14931-29.png
Submitted on: 18 August 2018.
Revised on: 16 November 2018.
Accepted on: 09 December 2018.
___________________JOM---SPRINGER