الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::d41fefe1187ff86fa05f01c14350b451Testhttps://doi.org/10.2139/ssrn.2050751Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::68ae067e75fec8eadae11786b6f97d1dTesthttps://doi.org/10.2139/ssrn.1857282Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::d9f361558a1009ec600e6eea53e71169Testhttps://doi.org/10.2139/ssrn.1935730Test