الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::0fb1f53db19a231f86d1782c6fa7eb39Testhttps://doi.org/10.1007/s11629-018-4911-8Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::0ecd544d1c27a5a15fdadf3efb1fda80Testhttps://doi.org/10.1007/s11629-013-2594-8Test