http://reply.papertrans.cn/1/80/7988/7988-11.png
Submitted on: 22 May 2014.
Revised on: 23 June 2014.
Accepted on: 16 July 2014.
___________________ECONOMIST-NETHERLANDS---SPRINGER
http://reply.papertrans.cn/1/80/7988/7988-13.png
Submitted on: 30 August 2010.
Revised on: 03 November 2010.
Accepted on: 28 November 2010.
___________________ECONOMIST-NETHERLANDS---SPRINGER
http://reply.papertrans.cn/1/80/7988/7988-15.png
Submitted on: 27 March 2015.
Revised on: 07 June 2015.
Accepted on: 15 July 2015.
___________________ECONOMIST-NETHERLANDS---SPRINGER
Submitted on: 17 August 2018.
Revised on: 03 November 2018.
Accepted on: 23 November 2018.
___________________ECONOMIST-NETHERLANDS---SPRINGER
http://reply.papertrans.cn/1/80/7988/7988-18.png
http://reply.papertrans.cn/1/80/7988/7988-19.png
Submitted on: 21 August 2005.
Revised on: 19 November 2005.
Accepted on: 28 December 2005.
___________________ECONOMIST-NETHERLANDS---SPRINGER