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Submitted on: 28 December 2006.
Revised on: 05 January 2007.
Accepted on: 18 January 2007.
Materia-Rio de Janeiro---UNIV FED RIO DE JANEIRO, LAB HIDROGENIO
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Submitted on: 22 January 2009.
Revised on: 14 February 2009.
Accepted on: 01 March 2009.
Materia-Rio de Janeiro