الوصول الحر: https://doaj.org/article/d6872a6fc67c4a24b92c5823ecbd5825Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::04cf44b17490b63a226cb30e3f2278eeTesthttp://europepmc.org/articles/PMC8316633Test