Submitted on: 20 May 2004.
Revised on: 30 July 2004.
Accepted on: 30 August 2004.
___________________Estudios Sociales-Revista Universitaria Semestral
Submitted on: 31 July 2015.
Revised on: 01 September 2015.
Accepted on: 18 September 2015.
___________________Estudios Sociales-Revista Universitaria Semestral
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Submitted on: 27 July 2008.
Revised on: 13 September 2008.
Accepted on: 29 October 2008.
___________________Estudios Sociales-Revista Universitaria Semestral
Submitted on: 20 February 2002.
Revised on: 30 May 2002.
Accepted on: 11 July 2002.
___________________Estudios Sociales-Revista Universitaria Semestral
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Submitted on: 29 December 2018.
Revised on: 22 January 2019.
Accepted on: 22 February 2019.
___________________Estudios Sociales-Revista Universitaria Semestral
Submitted on: 25 April 2013.
Revised on: 25 June 2013.
Accepted on: 27 July 2013.
___________________Estudios Sociales-Revista Universitaria Semestral