الوصول الحر: https://doaj.org/article/f1285e4c1aec4005a0de1e806cb0ea03Test
الإتاحة: https://doaj.org/article/261bda6a68ed410db867db6204b2b9c5Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::159dc6b9f9a97924f71879fbe6b97204Test