الوصول الحر: https://doaj.org/article/9ad905075dc54a1eb5349c3b54410e1dTest
الوصول الحر: https://doaj.org/article/bfaa9d41cd814ee7baf5d1a15df4896cTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::cce9347e77c9e1edd896e28dbbd24a47Testhttps://doi.org/10.1183/13993003.congress-2021.pa749Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::6d84b492b028d9dc67d4713268b3b178Testhttps://doi.org/10.1183/13993003.congress-2020.1925Test