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Submitted on: 09 September 1998.
Revised on: 20 November 1998.
Accepted on: 13 January 1999.
___________________Cuaderno Activa---TECNOLOGICO ANTIOQUIA-INST UNIV, FAC INGENIERIA
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Submitted on: 28 November 2017.
Revised on: 23 December 2017.
Accepted on: 09 January 2018.
___________________Cuaderno Activa---TECNOLOGICO ANTIOQUIA-INST UNIV, FAC INGENIERIA
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Submitted on: 03 February 2007.
Revised on: 04 March 2007.
Accepted on: 29 March 2007.
___________________Cuaderno Activa---TECNOLOGICO ANTIOQUIA-INST UNIV, FAC INGENIERIA