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free resource Scientific Electronic Library Online https://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013005001513&lng=en&nrm=iso&tlng=en
Full text from free resource CORE https://core.ac.uk/reader/186758785?utm_source=linkout
free resource scite Smart Citations https://scite.ai/reports/23460429