الوصول الحر: https://doaj.org/article/32fc85f80c044e6eb4476952c3c0a85cTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::1aee22b8f9c6ddc92b23635fd815eb06Testhttps://doi.org/10.1016/s0169-5002Test(23)00577-9
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::70b5e372456673d5f942232795e6b8a8Testhttps://doi.org/10.1016/s0169-5002Test(22)00061-7