Submitted on: 03 November 2001.
Revised on: 05 February 2002.
Accepted on: 27 March 2002.
___________________Estudios Gerenciales---UNIV ICESI
Submitted on: 23 April 2001.
Revised on: 26 June 2001.
Accepted on: 17 August 2001.
___________________Estudios Gerenciales---UNIV ICESI
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Submitted on: 08 July 2003.
Revised on: 14 October 2003.
Accepted on: 14 November 2003.
___________________Estudios Gerenciales---UNIV ICESI
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Submitted on: 11 March 2006.
Revised on: 26 April 2006.
Accepted on: 20 June 2006.
___________________Estudios Gerenciales---UNIV ICESI
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Submitted on: 26 April 2007.
Revised on: 07 July 2007.
Accepted on: 19 July 2007.
___________________Estudios Gerenciales---UNIV ICESI
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Submitted on: 18 October 2006.
Revised on: 04 December 2006.
Accepted on: 20 January 2007.
___________________Estudios Gerenciales---UNIV ICESI