الإتاحة: https://doi.org/10.33115/udg_bib/cp.v2i02.22108Testhttp://hdl.handle.net/10256/8779Testhttps://www.raco.cat/index.php/communication/article/view/276471Test
الإتاحة: https://doi.org/10.33115/udg_bib/cp.v2i02.22107Testhttp://hdl.handle.net/10256/8778Testhttps://www.raco.cat/index.php/communication/article/view/276470Test