الوصول الحر: https://doaj.org/article/079156d0041a4c42acafaec995b75adaTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::993d43407b78dfcb187bc0810a1156c3Testhttps://doi.org/10.1007/978-1-61779-129-1_18Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c9303381e5327b68fc6465265d13502Testhttps://pubmed.ncbi.nlm.nih.gov/19132090Test