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Submitted on: 18 December 2002.
Revised on: 10 January 2003.
Accepted on: 08 February 2003.
___________________Ingenius-Revista de Ciencia y Tecnologia
Submitted on: 03 March 2010.
Revised on: 08 May 2010.
Accepted on: 05 July 2010.
___________________Ingenius-Revista de Ciencia y Tecnologia
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Submitted on: 19 November 2000.
Revised on: 13 March 2001.
Accepted on: 26 April 2001.
___________________Ingenius-Revista de Ciencia y Tecnologia
Submitted on: 30 April 2005.
Revised on: 31 July 2005.
Accepted on: 23 September 2005.
___________________Ingenius-Revista de Ciencia y Tecnologia
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Submitted on: 20 July 2014.
Revised on: 04 October 2014.
Accepted on: 23 November 2014.
___________________Ingenius-Revista de Ciencia y Tecnologia