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Submitted on: 26 March 2005.
Revised on: 06 May 2005.
Accepted on: 18 May 2005.
Magis-Revista Internacional de Investigacion en Educacion
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Submitted on: 06 March 2004.
Revised on: 24 March 2004.
Accepted on: 06 April 2004.
NULL
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Submitted on: 21 November 2003.
Revised on: 19 December 2003.
Accepted on: 27 December 2003.
NULL