الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d496006d1a84291086932122fec94a03Testhttps://doi.org/10.1089/cdd.1984.1.239Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4af5334e8ad64a1aeb1c224f8fc9a89eTesthttps://doi.org/10.1089/cdd.1986.3.147Test