http://reply.papertrans.cn/3/211/21095/21095-31.png
Submitted on: 28 January 2021.
Revised on: 22 February 2021.
Accepted on: 28 February 2021.
MACHINE TRANSLATION---SPRINGER HEIDELBERGN/A
http://reply.papertrans.cn/3/211/21095/21095-33.png
http://reply.papertrans.cn/3/211/21095/21095-34.png
Submitted on: 24 December 2002.
Revised on: 15 January 2003.
Accepted on: 07 February 2003.
MACHINE TRANSLATION---SPRINGER HEIDELBERGN/A
http://reply.papertrans.cn/3/211/21095/21095-36.png