Submitted on: 23 September 2000.
Revised on: 08 November 2000.
Accepted on: 28 December 2000.
___________________Eccos-Revista Cientifica---CENTRO UNIV NOVE JULHO
Submitted on: 02 April 2023.
Revised on: 12 May 2023.
Accepted on: 02 June 2023.
___________________Eccos-Revista Cientifica---CENTRO UNIV NOVE JULHO
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Submitted on: 29 December 2013.
Revised on: 23 April 2014.
Accepted on: 08 June 2014.
___________________Eccos-Revista Cientifica---CENTRO UNIV NOVE JULHO
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Submitted on: 23 September 2013.
Revised on: 05 November 2013.
Accepted on: 22 December 2013.
___________________Eccos-Revista Cientifica---CENTRO UNIV NOVE JULHO
Submitted on: 20 May 2019.
Revised on: 11 August 2019.
Accepted on: 12 September 2019.
___________________Eccos-Revista Cientifica---CENTRO UNIV NOVE JULHO
Submitted on: 24 January 2018.
Revised on: 21 March 2018.
Accepted on: 04 May 2018.
___________________Eccos-Revista Cientifica---CENTRO UNIV NOVE JULHO
Submitted on: 11 February 2002.
Revised on: 12 May 2002.
Accepted on: 09 July 2002.
___________________Eccos-Revista Cientifica---CENTRO UNIV NOVE JULHO