الوصول الحر: https://doaj.org/article/93ae8d067940452fb391568395e4fc0eTest
الوصول الحر: https://doaj.org/article/4164a803267e4c2980b1094e05918edcTest
الوصول الحر: https://doaj.org/article/23751c7a887c4ffe9f4476ab4cd61091Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5faddc02715e5ef3e50e83a01ffef8f5Testhttps://doi.org/10.1371/journal.pone.0204490Test