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Submitted on: 31 January 2020.
Revised on: 23 February 2020.
Accepted on: 20 March 2020.
Nexo Revista Cientifica---UNIV NACL INGENIERIA
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Submitted on: 05 August 2001.
Revised on: 01 September 2001.
Accepted on: 14 September 2001.
NULL
Submitted on: 30 October 2003.
Revised on: 22 November 2003.
Accepted on: 29 November 2003.
Nexo Revista Cientifica---UNIV NACL INGENIERIA
Submitted on: 15 April 2005.
Revised on: 26 April 2005.
Accepted on: 04 May 2005.
NULL
Submitted on: 23 November 2008.
Revised on: 15 December 2008.
Accepted on: 09 January 2009.
Nexo Revista Cientifica---UNIV NACL INGENIERIA
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