Submitted on: 10 March 1998.
Revised on: 21 April 1998.
Accepted on: 11 June 1998.
___________________Custos e Agronegocio On Line---UNIV FED RURAL PERNAMBUCO, DEPT ADMINISTRACAO
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Submitted on: 11 October 2010.
Revised on: 09 November 2010.
Accepted on: 06 January 2011.
___________________Custos e Agronegocio On Line---UNIV FED RURAL PERNAMBUCO, DEPT ADMINISTRACAO
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