الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::684b66230d955fa6c582f16032abbeb8Testhttps://doaj.org/article/5fab3fb3577a4ec7b1ec4b52d0640cddTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::182e1917ebf0f4ddafd0ba7c566e8396Testhttp://europepmc.org/articles/PMC3997384?pdf=renderTest