الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2fc1e421dad7ff5a6e07b706e6cff75bTesthttps://doi.org/10.1111/j.1432-1033.1994.tb18771.xTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c46f164170981e9a73cc29b88622bbe1Testhttps://pubmed.ncbi.nlm.nih.gov/3743649Test