http://reply.papertrans.cn/1/89/8805/8805-11.png
http://reply.papertrans.cn/1/89/8805/8805-12.png
http://reply.papertrans.cn/1/89/8805/8805-13.png
Submitted on: 30 April 2018.
Revised on: 06 July 2018.
Accepted on: 25 July 2018.
___________________ERKENNTNIS---SPRINGER
Submitted on: 28 September 2011.
Revised on: 10 November 2011.
Accepted on: 08 December 2011.
___________________ERKENNTNIS---SPRINGER
Submitted on: 11 April 2006.
Revised on: 15 May 2006.
Accepted on: 14 July 2006.
___________________ERKENNTNIS---SPRINGER
http://reply.papertrans.cn/1/89/8805/8805-17.png
http://reply.papertrans.cn/1/89/8805/8805-18.png
http://reply.papertrans.cn/1/89/8805/8805-19.png
Submitted on: 23 March 2000.
Revised on: 02 May 2000.
Accepted on: 10 June 2000.
___________________ERKENNTNIS---SPRINGER