الوصول الحر: https://doaj.org/article/46e3fc0616f94c3a9b413970ac0543e2Test
الوصول الحر: https://doaj.org/article/551eb9b6fd134c648cf6f953bab63d51Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b051190f38305f4146f08b43bd015a89Testhttp://www.sciencedirect.com/science/article/pii/S2213231720310016Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d8b380cb573d443cfa0deb9892883029Testhttp://www.sciencedirect.com/science/article/pii/S2589537019302585Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::4ba39d9b8e85473548af56557e5f6ebfTesthttps://doi.org/10.1016/b978-0-12-816422-8.09996-7Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::b36c702c235545a85d58ecabc353d860Testhttps://doi.org/10.1016/b978-0-323-64068-8.00055-9Test