الوصول الحر: https://escholarship.org/uc/item/5zn3k8hsTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f4e2f3770f02374c7d7a8cbe9faaa9a6Testhttps://escholarship.org/uc/item/5zn3k8hsTest