Submitted on: 30 December 2014.
Revised on: 06 February 2015.
Accepted on: 16 February 2015.
___________________Cuadernos del CLAEH-Centro Latinoamericano de Economia Humana
Submitted on: 29 April 2020.
Revised on: 28 May 2020.
Accepted on: 02 July 2020.
___________________Cuadernos del CLAEH-Centro Latinoamericano de Economia Humana
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http://reply.papertrans.cn/1/68/6770/6770-34.png
Submitted on: 17 September 2000.
Revised on: 11 January 2001.
Accepted on: 13 February 2001.
___________________Cuadernos del CLAEH-Centro Latinoamericano de Economia Humana
Submitted on: 27 April 2007.
Revised on: 24 June 2007.
Accepted on: 11 August 2007.
___________________Cuadernos del CLAEH-Centro Latinoamericano de Economia Humana