URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::82a8797f691556aa1ae2443128e9ec98
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ae839d98270fb055f44cd6358f29b09
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::da5b981134cfc07e83a6fe7df84b5845
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::09668ecfac6748d7eb00f8c6328ad9f6https://doi.org/10.1016/s0140-6736(83)92277-8