http://reply.papertrans.cn/1/80/7965/7965-11.png
Submitted on: 28 March 2000.
Revised on: 16 July 2000.
Accepted on: 11 August 2000.
___________________Economics & Sociology---CENTER SOCIOLOGICAL RESEARCH
http://reply.papertrans.cn/1/80/7965/7965-13.png
Submitted on: 25 April 2011.
Revised on: 16 July 2011.
Accepted on: 06 September 2011.
___________________Economics & Sociology---CENTER SOCIOLOGICAL RESEARCH
Submitted on: 21 August 2023.
Revised on: 15 September 2023.
Accepted on: 01 October 2023.
___________________Economics & Sociology---CENTER SOCIOLOGICAL RESEARCH
Submitted on: 04 January 2011.
Revised on: 28 April 2011.
Accepted on: 29 May 2011.
___________________Economics & Sociology---CENTER SOCIOLOGICAL RESEARCH
http://reply.papertrans.cn/1/80/7965/7965-17.png
Submitted on: 29 September 2007.
Revised on: 22 October 2007.
Accepted on: 19 November 2007.
___________________Economics & Sociology---CENTER SOCIOLOGICAL RESEARCH
http://reply.papertrans.cn/1/80/7965/7965-19.png
Submitted on: 27 February 2018.
Revised on: 13 May 2018.
Accepted on: 09 June 2018.
___________________Economics & Sociology---CENTER SOCIOLOGICAL RESEARCH