الوصول الحر: https://escholarship.org/uc/item/2x40z5h4Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::72c115469b43cda5acae129df006f7d5Testhttps://escholarship.org/uc/item/2x40z5h4Test