الوصول الحر: https://doaj.org/article/327a66fe423c41fe92815ada828bf0d6Test
الوصول الحر: https://doaj.org/article/2c3418b7be394fa89f800636a45bfdc1Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::88d3efc73d1dbc1caeea25119a76fc94Testhttps://doi.org/10.1186/s12889-021-11291-wTest