الوصول الحر: https://doaj.org/article/4295b65ff4a54da78991df7d347fbb00Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::65e1c937d30fcaa583bc58d32918a233Testhttps://www.mdpi.com/1422-0067/21/20/7610Test