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Submitted on: 17 July 2000.
Revised on: 30 July 2000.
Accepted on: 10 August 2000.
Revista Pos Ciencias Sociais---UNIV FED MARANHAO, CENTRO CIENCIAS HUMANAS
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Submitted on: 23 August 2016.
Revised on: 04 September 2016.
Accepted on: 21 September 2016.
Revista Pos Ciencias Sociais
Submitted on: 17 April 2001.
Revised on: 30 May 2001.
Accepted on: 17 June 2001.
Revista Pos Ciencias Sociais---UNIV FED MARANHAO, CENTRO CIENCIAS HUMANAS