الإتاحة: https://doi.org/10.4415/ANN_23_01_05Testhttps://annali.iss.it/index.php/anna/article/view/1462Test
الإتاحة: https://annali.iss.it/index.php/anna/article/view/1177Test
الإتاحة: https://annali.iss.it/index.php/anna/article/view/1176Test
الإتاحة: https://annali.iss.it/index.php/anna/article/view/1136Test
الإتاحة: https://annali.iss.it/index.php/anna/article/view/199Test