الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1980-65742020000100302Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c37cf7f9eac64015eadaa20cf9106fbdTesthttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S1980-65742020000100302&lng=en&tlng=enTest