الوصول الحر: https://doaj.org/article/b8be1bb70deb4ddbad8a01591692d77bTest
الوصول الحر: https://doaj.org/article/d751dc1930b34e03aa23445eaa34c55fTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::18a915dca798720321ef382a5e991e84Testhttps://doi.org/10.1155/2021/3402496Test