الوصول الحر: https://doaj.org/article/28ccb3210c1344c69c7fffc103ce20f7Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dd8e4e6404d9898acf8db49cef0cbbb2Testhttps://avesis.yyu.edu.tr/publication/details/9d0aefa4-c685-4348-8d15-aced3b0f0dc4/oaiTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::0a275b400ed62e74a1157f7fb9313e37Testhttps://doi.org/10.1007/bf00015726Test