الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0723848cd4887e0f96d28a9f1819447cTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::082a9d1bd273ad5e8dbaf53d050157a8Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::d05f42800cdcbca5a725d835d5842e90Testhttps://doi.org/10.1070/rc1994v063n06abeh000101Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::9ac3ca1794270a634f2ee6b727e426d7Testhttps://doi.org/10.1070/rc1979v048n11abeh002428Test