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Submitted on: 18 April 2003.
Revised on: 17 May 2003.
Accepted on: 11 June 2003.
Psicologia Conocimiento y Sociedad
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Submitted on: 18 September 2005.
Revised on: 09 October 2005.
Accepted on: 17 October 2005.
Psicologia Conocimiento y Sociedad
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