Submitted on: 13 October 2000.
Revised on: 18 November 2000.
Accepted on: 26 November 2000.
NULL
Submitted on: 20 March 2010.
Revised on: 07 April 2010.
Accepted on: 26 April 2010.
NULL
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Submitted on: 08 March 2005.
Revised on: 16 April 2005.
Accepted on: 23 April 2005.
NULL
Submitted on: 18 February 2009.
Revised on: 17 March 2009.
Accepted on: 28 March 2009.
Scire-Representacion y Organizacion del Conocimiento
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Submitted on: 10 March 1998.
Revised on: 24 March 1998.
Accepted on: 07 April 1998.
NULL