الوصول الحر: https://doaj.org/article/01510ad0273f44ddb55fbf302402dc7dTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::dd787d6ff164e1796876b1886d788e78Testhttps://doi.org/10.33091/amj.2020.170939Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::c9e1acaa81c44e2ed6bd727ad3857237Testhttps://doi.org/10.1016/j.ijom.2013.07.019Test