الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-86502017000900726Test
الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-86502015000400289Test
الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-86502013001200009Test
الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-86502013000300008Test
الإتاحة: https://doi.org/10.34117/bjdv6n8-397Testhttps://www.brazilianjournals.com/index.php/BRJD/article/view/15214Test
الإتاحة: https://doi.org/10.34117/bjdv6n8-395Testhttps://www.brazilianjournals.com/index.php/BRJD/article/view/15210Test