الوصول الحر: https://www.jstor.org/stable/2899629Test
الوصول الحر: https://www.jstor.org/stable/2899627Test
الوصول الحر: https://www.jstor.org/stable/2899266Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=pmid_dedup__::0a4155ea6ebf6534f4d9066d801bc4e3Testhttps://pubmed.ncbi.nlm.nih.gov/8928009Test