Submitted on: 18 January 2011.
Revised on: 19 February 2011.
Accepted on: 07 March 2011.
MACHINE TRANSLATION---SPRINGER HEIDELBERGN/A
http://reply.papertrans.cn/3/211/21095/21095-22.png
Submitted on: 12 November 2019.
Revised on: 13 December 2019.
Accepted on: 10 January 2020.
NULL
http://reply.papertrans.cn/3/211/21095/21095-24.png
Submitted on: 21 September 2016.
Revised on: 02 November 2016.
Accepted on: 25 November 2016.
NULL
Submitted on: 14 February 2016.
Revised on: 29 February 2016.
Accepted on: 14 March 2016.
NULL
http://reply.papertrans.cn/3/211/21095/21095-27.png
http://reply.papertrans.cn/3/211/21095/21095-28.png
Submitted on: 28 March 2005.
Revised on: 10 May 2005.
Accepted on: 06 June 2005.
MACHINE TRANSLATION---SPRINGER HEIDELBERGN/A
http://reply.papertrans.cn/3/211/21095/21095-30.png