الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6dfec676b1d1a55a1d6fecaf2f248804Testhttps://pubmed.ncbi.nlm.nih.gov/32248841Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1b93503933d08ef4fc114956a8aa81bcTesthttp://europepmc.org/articles/PMC6015340Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2f48a42ea90af87207947b62b6d96216Testhttp://europepmc.org/articles/PMC4631458?pdf=renderTest