الوصول الحر: https://doaj.org/article/8396dd52024e4a49887306923cc72519Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5c692f687f7cb2fbcbf326289bb2e7feTesthttps://doi.org/10.1017/s0007114518003501Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e72b20fa7139a43508199359101a75a5Testhttps://centaur.reading.ac.uk/85763/1/1-s2.0-S2590157519300495-main.pdfTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::97d25ff93edb360013009b1d8dd25fe8Testhttps://doi.org/10.3945/jn.115.226001Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9822c18635a1d131ba4054b793c3dc3cTesthttps://doi.org/10.1017/s0029665120005327Test