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Submitted on: 20 April 2000.
Revised on: 26 June 2000.
Accepted on: 12 July 2000.
___________________Apuntes del CENES---UNIV PEDAGOGICA & TECNOLOGICA COLOMBIA
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Submitted on: 07 June 2021.
Revised on: 04 September 2021.
Accepted on: 29 October 2021.
___________________Apuntes del CENES---UNIV PEDAGOGICA & TECNOLOGICA COLOMBIA
Submitted on: 24 November 2007.
Revised on: 05 January 2008.
Accepted on: 17 February 2008.
___________________Apuntes del CENES---UNIV PEDAGOGICA & TECNOLOGICA COLOMBIA
Submitted on: 31 October 2022.
Revised on: 30 November 2022.
Accepted on: 28 December 2022.
___________________Apuntes del CENES---UNIV PEDAGOGICA & TECNOLOGICA COLOMBIA
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Submitted on: 16 October 2024.
Revised on: 05 February 2025.
Accepted on: 21 March 2025.
___________________Apuntes del CENES---UNIV PEDAGOGICA & TECNOLOGICA COLOMBIA