Submitted on: 01 April 2002.
Revised on: 18 June 2002.
Accepted on: 03 August 2002.
___________________COMMUNICATIONS ON PURE AND APPLIED ANALYSIS
http://reply.papertrans.cn/1/61/6040/6040-32.png
http://reply.papertrans.cn/1/61/6040/6040-33.png
Submitted on: 22 September 2013.
Revised on: 19 November 2013.
Accepted on: 10 December 2013.
___________________COMMUNICATIONS ON PURE AND APPLIED ANALYSIS
http://reply.papertrans.cn/1/61/6040/6040-35.png
Submitted on: 07 August 2002.
Revised on: 07 September 2002.
Accepted on: 06 November 2002.
___________________COMMUNICATIONS ON PURE AND APPLIED ANALYSIS