الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3a9a094ab5bd63c31f99bbb61bb99d58Testhttps://doi.org/10.1055/s-0033-1354424Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::50c23d62681ccfce3d60efb0d884a9aeTesthttps://doi.org/10.1055/s-0037-1616251Test