الوصول الحر: https://doaj.org/article/eb2e400534204e2bb5cccc0194309c1fTest
الوصول الحر: https://doaj.org/article/5551845783f348f9a7cd6095b897088dTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::abc8fdef5a7535890ebbdfb849a76e15Testhttps://doaj.org/article/eb2e400534204e2bb5cccc0194309c1fTest
الإتاحة: https://doi.org/10.1186/1479-5876-4-23Testhttps://doaj.org/article/bc435115daba49ec8022f05aaa3008fbTest