http://reply.papertrans.cn/1/41/4059/4059-31.png
http://reply.papertrans.cn/1/41/4059/4059-32.png
Submitted on: 28 December 1998.
Revised on: 30 January 1999.
Accepted on: 19 March 1999.
___________________Boundary Value Problems---SPRINGER
Submitted on: 04 March 2005.
Revised on: 26 April 2005.
Accepted on: 22 June 2005.
___________________Boundary Value Problems---SPRINGER
http://reply.papertrans.cn/1/41/4059/4059-35.png
http://reply.papertrans.cn/1/41/4059/4059-36.png