الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c78b9aec3b2708caaa67d13d22053a5Testhttps://opus.bibliothek.uni-augsburg.de/opus4/frontdoor/index/index/docId/93019Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2404eddc6b0256897213bd9bf695856dTesthttps://hdl.handle.net/2078.1/222455Test