Submitted on: 03 September 2022.
Revised on: 13 October 2022.
Accepted on: 19 November 2022.
___________________GAYANA---EDICIONES UNIV, CONCEPCION
Submitted on: 13 November 2010.
Revised on: 15 December 2010.
Accepted on: 16 January 2011.
___________________GAYANA---EDICIONES UNIV, CONCEPCION
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Submitted on: 15 September 2012.
Revised on: 06 December 2012.
Accepted on: 18 December 2012.
___________________GAYANA---EDICIONES UNIV, CONCEPCION
http://reply.papertrans.cn/2/104/10394/10394-25.png
Submitted on: 25 October 2000.
Revised on: 25 November 2000.
Accepted on: 16 December 2000.
___________________GAYANA---EDICIONES UNIV, CONCEPCION
http://reply.papertrans.cn/2/104/10394/10394-27.png
Submitted on: 17 March 2004.
Revised on: 08 July 2004.
Accepted on: 10 August 2004.
___________________GAYANA---EDICIONES UNIV, CONCEPCION
Submitted on: 24 June 2020.
Revised on: 12 October 2020.
Accepted on: 15 November 2020.
___________________GAYANA---EDICIONES UNIV, CONCEPCION
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