الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dbb810a52766d5d42a02efed467e11d9Testhttps://doi.org/10.4244/eijy15m12_01Test
الإتاحة: https://doi.org/10.4244/EIJY15M12_01Testhttp://hdl.handle.net/11573/1327210Test