الوصول الحر: https://doaj.org/article/6478b41442be402cb6760fbd0ff9c313Test
الوصول الحر: https://doaj.org/article/6c014ce10ee74ccda5037c7d5edcfd98Test
الوصول الحر: https://doaj.org/article/50eef7ef9d0a4a898d2fdcedd12a59f8Test
الوصول الحر: https://doaj.org/article/5450cd6a92254c7a91a7ae0279a068aaTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::414b2b0037273e8f5b9c33f6e446b561Testhttps://doi.org/10.1016/s2095-3119Test(20)63491-8
الوصول الحر: https://doaj.org/article/2a64673b8b1d4819a7c7ef36d52db573Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2b7877d0abe08227d4b609f91795f7c1Testhttp://www.sciencedirect.com/science/article/pii/S2095311919627589Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c88956352f88e6a016d144f92c6ec63dTesthttps://doi.org/10.1016/s2095-3119Test(18)62087-8