الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2175-78602015000401033Test
الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1982-56762008000400006Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=od_______608::e19997ed4af39fc53f7c805e006b7f56Testhttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S1982-56762008000400006&lng=en&tlng=enTest