الوصول الحر: https://doaj.org/article/752825063a174ab692fcf9ed35696413Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::cad5c8983d96d453bbe3c52354ec8a29Testhttps://doi.org/10.4240/wjgs.v15.i5.940Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::c882fc71fa5ba7433c28ec9de98f416eTesthttps://doi.org/10.4253/wjge.v15.i2.44Test