الوصول الحر: https://doaj.org/article/99637642e7ec416daedf174157d661b2Test
الإتاحة: https://doi.org/10.1155/2021/6621991Testhttps://doaj.org/article/d76417cc37f14c3bb27f68d14062e564Test
الإتاحة: https://doi.org/10.1016/j.gaceta.2016.04.010Testhttps://doaj.org/article/9363f8ecfa984e1a9004b476fdd16945Test