الوصول الحر: https://doaj.org/article/a2770e8d1fb24e4fa0c418672777a8d8Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::491ed37dc1ba1ecef5588c1745163b44Test
الإتاحة: https://doi.org/10.3310/hta23230Testhttp://hdl.handle.net/10044/1/70781Test
الإتاحة: https://doi.org/10.1159/000506687Testhttp://hdl.handle.net/11336/142408Test