http://reply.papertrans.cn/3/203/20251/20251-21.png
http://reply.papertrans.cn/3/203/20251/20251-22.png
http://reply.papertrans.cn/3/203/20251/20251-23.png
Submitted on: 30 June 2002.
Revised on: 10 July 2002.
Accepted on: 25 July 2002.
JSIAM Letters---JAPAN SOC INDUSTRIAL & APPLIED MATHEMATICS-JSIAM
http://reply.papertrans.cn/3/203/20251/20251-25.png
Submitted on: 25 December 2008.
Revised on: 03 February 2009.
Accepted on: 10 February 2009.
JSIAM Letters
http://reply.papertrans.cn/3/203/20251/20251-27.png
Submitted on: 28 July 2009.
Revised on: 09 September 2009.
Accepted on: 07 October 2009.
JSIAM Letters
Submitted on: 01 March 2011.
Revised on: 13 April 2011.
Accepted on: 11 May 2011.
JSIAM Letters---JAPAN SOC INDUSTRIAL & APPLIED MATHEMATICS-JSIAM
http://reply.papertrans.cn/3/203/20251/20251-30.png