الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::40f04ff031b6f5ac9346613566575e91Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ce26264fd70b4fe42ce16d89984e101eTesthttp://www.sciencedirect.com/science/article/pii/S1756464615004594Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8774f725085389dc2d3a5a6b5a362e17Testhttps://doi.org/10.1177/1758835918821021Test