الوصول الحر: https://doaj.org/article/9e36fab9d15c42f3bc21b2580a2d08aeTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::156eefe1b0a7d277da15a6d539740262Testhttps://doi.org/10.1155/2014/241840Test