http://reply.papertrans.cn/3/226/22513/22513-11.png
http://reply.papertrans.cn/3/226/22513/22513-12.png
Submitted on: 14 October 2011.
Revised on: 27 October 2011.
Accepted on: 19 November 2011.
Nankai Business Review International
http://reply.papertrans.cn/3/226/22513/22513-14.png
Submitted on: 29 October 2017.
Revised on: 23 November 2017.
Accepted on: 29 November 2017.
Nankai Business Review International
http://reply.papertrans.cn/3/226/22513/22513-16.png
Submitted on: 02 November 2013.
Revised on: 04 December 2013.
Accepted on: 19 December 2013.
Nankai Business Review International
http://reply.papertrans.cn/3/226/22513/22513-18.png
Submitted on: 17 July 2008.
Revised on: 18 August 2008.
Accepted on: 09 September 2008.
Nankai Business Review International
Submitted on: 10 April 2017.
Revised on: 18 May 2017.
Accepted on: 24 May 2017.
Nankai Business Review International