URL الوصول: https://doaj.org/article/2290d6befc9c4d81b46a069ef35974d5
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8ec88cf34be7594c6bdee05464449a72http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-70942013000400013&lng=en&tlng=en
URL الوصول: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::55d1288da882de0b8e427c4f33c9f2cehttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-70942013000400013&lng=en&tlng=en