There is a good number of scientific studies available for download with free access for those who want to investigate further on the subject.
Below we suggest three electronic portals where you can find quite interesting materials.
http://cutter.unicamp.br/
http://www.dominiopublico.gov.br/pesquisa/PesquisaPeriodicoForm.do
http://acessolivre.capes.gov.br/
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