الوصول الحر: https://doaj.org/article/9b9a0afaaa014eb994a2ec180cecf300Test
الوصول الحر: https://doaj.org/article/0817b2a03e22460ea0e879944995ae58Test
الوصول الحر: https://doaj.org/article/e36544d08981429189993288d47c6fa6Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9b0d1e500faa8ff03e2fe649313f73eaTest
الإتاحة: https://doi.org/10.3847/1538-4365/ac072aTesthttp://hdl.handle.net/2318/1804640Testhttps://arxiv.org/abs/2106.00100Test