الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572019000100469Test
الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572007000300012Test
الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572007000200012Test
الوصول الحر: https://doaj.org/article/a4e7d3b6d5ff499db76b45092d2fdb7fTest
الوصول الحر: https://doaj.org/article/a6f300faee2f45bc918176f1bd7ea35fTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f51d5063ac4d71acf654665c516f904fTesthttp://europepmc.org/articles/PMC4327470Test
الوصول الحر: https://doaj.org/article/c90f91315061472380de810155da3aa6Test