الوصول الحر: https://doaj.org/article/8b3f6b51b0424852bab9b3e43566fc7fTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6dc74584a68b8d04abe62be69e9cf99fTesthttps://pubmed.ncbi.nlm.nih.gov/34211247Test