الوصول الحر: https://doaj.org/article/232d7e107f3c40fbbae82212d4004695Test
الإتاحة: https://doi.org/10.1155/2015/961526Testhttps://doaj.org/article/bc97012e03224a069d5b74e6d041f566Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1d14dd16e280c4bfae5f20b83420527aTesthttps://doi.org/10.1155/2018/8307591Test