http://reply.papertrans.cn/3/293/29244/29244-31.png
Submitted on: 26 July 2003.
Revised on: 24 August 2003.
Accepted on: 09 September 2003.
TECHNOVATION
http://reply.papertrans.cn/3/293/29244/29244-33.png
http://reply.papertrans.cn/3/293/29244/29244-34.png
Submitted on: 25 September 2002.
Revised on: 02 November 2002.
Accepted on: 15 November 2002.
TECHNOVATION
Submitted on: 08 October 2001.
Revised on: 27 October 2001.
Accepted on: 02 November 2001.
TECHNOVATION---ELSEVIER