http://reply.papertrans.cn/3/293/29245/29245-11.png
Submitted on: 11 October 2006.
Revised on: 12 November 2006.
Accepted on: 28 November 2006.
TechTrends---SPRINGER INT PUBL AG
http://reply.papertrans.cn/3/293/29245/29245-13.png
Submitted on: 15 June 2011.
Revised on: 19 July 2011.
Accepted on: 16 August 2011.
NULL
http://reply.papertrans.cn/3/293/29245/29245-15.png
http://reply.papertrans.cn/3/293/29245/29245-16.png
http://reply.papertrans.cn/3/293/29245/29245-17.png
Submitted on: 28 October 2000.
Revised on: 09 November 2000.
Accepted on: 20 November 2000.
TechTrends---SPRINGER INT PUBL AG
Submitted on: 10 July 2008.
Revised on: 22 August 2008.
Accepted on: 07 September 2008.
NULL
Submitted on: 17 February 2018.
Revised on: 04 March 2018.
Accepted on: 24 March 2018.
TechTrends---SPRINGER INT PUBL AG