http://reply.papertrans.cn/2/189/18885/18885-11.png
http://reply.papertrans.cn/2/189/18885/18885-12.png
http://reply.papertrans.cn/2/189/18885/18885-13.png
Submitted on: 20 September 1998.
Revised on: 22 December 1998.
Accepted on: 10 January 1999.
___________________Journal of Poverty and Social Justice
Submitted on: 10 September 2012.
Revised on: 01 January 2013.
Accepted on: 21 January 2013.
___________________Journal of Poverty and Social Justice
http://reply.papertrans.cn/2/189/18885/18885-16.png
http://reply.papertrans.cn/2/189/18885/18885-17.png
Submitted on: 26 August 2005.
Revised on: 11 December 2005.
Accepted on: 31 January 2006.
___________________Journal of Poverty and Social Justice
http://reply.papertrans.cn/2/189/18885/18885-19.png
http://reply.papertrans.cn/2/189/18885/18885-20.png